Merge branch 'ca' into ib

Combine ca into ia to become new ib VPS.

3 files changed, 1171 insertions, 0 deletions

diff --git a/etc/postfix/aliases b/etc/postfix/aliases
new file mode 100644
index 00000000..a4c4f8a0
--- /dev/null
+++ b/etc/postfix/aliases
@@ -0,0 +1,274 @@
+#
+# Sample aliases file. Install in the location as specified by the
+# output from the command "postconf alias_maps". Typical path names
+# are /etc/aliases or /etc/mail/aliases.
+#
+#	>>>>>>>>>>      The program "newaliases" must be run after
+#	>> NOTE >>      this file is updated for any changes to
+#	>>>>>>>>>>      show through to Postfix.
+#
+
+# Person who should get root's mail. Don't receive mail as root!
+# https://wiki.archlinux.org/title/Postfix#Aliases
+root:		xyz
+
+# Basic system aliases -- these MUST be present
+MAILER-DAEMON:	postmaster
+postmaster:	root
+
+# General redirections for pseudo accounts
+bin:		root
+daemon:		root
+named:		root
+nobody:		root
+uucp:		root
+www:		root
+ftp-bugs:	root
+postfix:	root
+
+# Put your local aliases here.
+
+# Well-known aliases
+manager:	root
+dumper:		root
+operator:	root
+abuse:		postmaster
+
+# trap decode to catch security attacks
+decode:		root
+
+# ALIASES(5)                                                          ALIASES(5)
+# 
+# NAME
+#        aliases - Postfix local alias database format
+# 
+# SYNOPSIS
+#        newaliases
+# 
+# DESCRIPTION
+#        The  optional aliases(5) table (alias_maps) redirects mail
+#        for local recipients. The redirections  are  processed  by
+#        the Postfix local(8) delivery agent.
+# 
+#        This  is  unlike  virtual(5) aliasing (virtual_alias_maps)
+#        which applies to all recipients:  local(8),  virtual,  and
+#        remote, and which is implemented by the cleanup(8) daemon.
+# 
+#        Normally, the aliases(5) table is specified as a text file
+#        that  serves  as  input  to  the postalias(1) command. The
+#        result, an indexed file in dbm or db format, is  used  for
+#        fast  lookup  by  the  mail  system.  Execute  the command
+#        newaliases in order to  rebuild  the  indexed  file  after
+#        changing the Postfix alias database.
+# 
+#        When  the  table  is provided via other means such as NIS,
+#        LDAP or SQL, the same lookups are  done  as  for  ordinary
+#        indexed files.
+# 
+#        Alternatively,  the  table  can  be  provided  as  a regu-
+#        lar-expression map where patterns  are  given  as  regular
+#        expressions.  In  this  case,  the  lookups  are done in a
+#        slightly different way as described below  under  "REGULAR
+#        EXPRESSION TABLES".
+# 
+#        Users can control delivery of their own mail by setting up
+#        .forward files in their home directory.  Lines in per-user
+#        .forward files have the same syntax as the right-hand side
+#        of aliases(5) entries.
+# 
+#        The format of the alias database input file is as follows:
+# 
+#        o      An alias definition has the form
+# 
+#                    name: value1, value2, ...
+# 
+#        o      Empty  lines and whitespace-only lines are ignored,
+#               as are lines whose first  non-whitespace  character
+#               is a `#'.
+# 
+#        o      A  logical  line starts with non-whitespace text. A
+#               line that starts with whitespace continues a  logi-
+#               cal line.
+# 
+#        The  name is a local address (no domain part).  Use double
+#        quotes when the name contains any special characters  such
+#        as  whitespace,  `#',  `:',  or `@'. The name is folded to
+#        lowercase, in order to make database lookups case insensi-
+#        tive.
+# 
+#        In  addition,  when  an  alias exists for owner-name, this
+#        will override the envelope sender address, so that  deliv-
+#        ery diagnostics are directed to owner-name, instead of the
+#        originator   of   the   message    (for    details,    see
+#        owner_request_special,        expand_owner_alias       and
+#        reset_owner_alias).  This  is  typically  used  to  direct
+#        delivery  errors  to the maintainer of a mailing list, who
+#        is in a better position to deal with mailing list delivery
+#        problems than the originator of the undelivered mail.
+# 
+#        The value contains one or more of the following:
+# 
+#        address
+#               Mail  is  forwarded to address, which is compatible
+#               with the RFC 822 standard.
+# 
+#        /file/name
+#               Mail is appended to /file/name. For details on  how
+#               a  file  is written see the sections "EXTERNAL FILE
+#               DELIVERY" and "DELIVERY  RIGHTS"  in  the  local(8)
+#               documentation.   Delivery is not limited to regular
+#               files.  For example, to dispose of  unwanted  mail,
+#               deflect it to /dev/null.
+# 
+#        |command
+#               Mail  is  piped into command. Commands that contain
+#               special characters, such as whitespace,  should  be
+#               enclosed  between double quotes. For details on how
+#               a command is executed see "EXTERNAL COMMAND  DELIV-
+#               ERY" and "DELIVERY RIGHTS" in the local(8) documen-
+#               tation.
+# 
+#               When the command fails, a limited amount of command
+#               output  is  mailed  back  to  the sender.  The file
+#               /usr/include/sysexits.h defines the  expected  exit
+#               status  codes. For example, use "|exit 67" to simu-
+#               late a "user  unknown"  error,  and  "|exit  0"  to
+#               implement an expensive black hole.
+# 
+#        :include:/file/name
+#               Mail  is  sent  to  the  destinations listed in the
+#               named file.  Lines in :include: files have the same
+#               syntax as the right-hand side of alias entries.
+# 
+#               A  destination  can  be  any  destination  that  is
+#               described in this manual page. However, delivery to
+#               "|command" and /file/name is disallowed by default.
+#               To  enable,  edit  the  allow_mail_to_commands  and
+#               allow_mail_to_files configuration parameters.
+# 
+# ADDRESS EXTENSION
+#        When alias database search fails, and the recipient local-
+#        part contains  the  optional  recipient  delimiter  (e.g.,
+#        user+foo),  the  search  is  repeated  for  the unextended
+#        address (e.g., user).
+# 
+#        The  propagate_unmatched_extensions   parameter   controls
+#        whether  an  unmatched  address extension (+foo) is propa-
+#        gated to the result of table lookup.
+# 
+# CASE FOLDING
+#        The local(8) delivery agent always folds the search string
+#        to lowercase before database lookup.
+# 
+# REGULAR EXPRESSION TABLES
+#        This  section  describes how the table lookups change when
+#        the table is given in the form of regular expressions. For
+#        a  description  of regular expression lookup table syntax,
+#        see regexp_table(5) or pcre_table(5). NOTE: these  formats
+#        do not use ":" at the end of a pattern.
+# 
+#        Each  regular  expression  is applied to the entire search
+#        string. Thus, a search string user+foo is  not  broken  up
+#        into user and foo.
+# 
+#        Regular  expressions are applied in the order as specified
+#        in the table, until a regular  expression  is  found  that
+#        matches the search string.
+# 
+#        Lookup  results are the same as with indexed file lookups.
+#        For security reasons there is no support for $1,  $2  etc.
+#        substring interpolation.
+# 
+# SECURITY
+#        The  local(8)  delivery agent disallows regular expression
+#        substitution of $1 etc. in alias_maps, because that  would
+#        open a security hole.
+# 
+#        The  local(8) delivery agent will silently ignore requests
+#        to use the proxymap(8) server within  alias_maps.  Instead
+#        it  will  open the table directly.  Before Postfix version
+#        2.2, the local(8) delivery agent  will  terminate  with  a
+#        fatal error.
+# 
+# CONFIGURATION PARAMETERS
+#        The  following main.cf parameters are especially relevant.
+#        The text below provides  only  a  parameter  summary.  See
+#        postconf(5) for more details including examples.
+# 
+#        alias_database (see 'postconf -d' output)
+#               The  alias databases for local(8) delivery that are
+#               updated with "newaliases" or with "sendmail -bi".
+# 
+#        alias_maps (see 'postconf -d' output)
+#               Optional lookup tables with aliases that apply only
+#               to   local(8)   recipients;  this  is  unlike  vir-
+#               tual_alias_maps  that  apply  to  all   recipients:
+#               local(8), virtual, and remote.
+# 
+#        allow_mail_to_commands (alias, forward)
+#               Restrict  local(8)  mail  delivery to external com-
+#               mands.
+# 
+#        allow_mail_to_files (alias, forward)
+#               Restrict local(8) mail delivery to external  files.
+# 
+#        expand_owner_alias (no)
+#               When delivering to an alias "aliasname" that has an
+#               "owner-aliasname" companion alias, set the envelope
+#               sender    address   to   the   expansion   of   the
+#               "owner-aliasname" alias.
+# 
+#        propagate_unmatched_extensions (canonical, virtual)
+#               What address lookup tables copy an  address  exten-
+#               sion from the lookup key to the lookup result.
+# 
+#        owner_request_special (yes)
+#               Enable special treatment for owner-listname entries
+#               in the aliases(5) file, and don't split owner-list-
+#               name  and  listname-request address localparts when
+#               the recipient_delimiter is set to "-".
+# 
+#        recipient_delimiter (empty)
+#               The set of characters that can  separate  an  email
+#               address  localpart,  user  name, or a .forward file
+#               name from its extension.
+# 
+#        Available in Postfix version 2.3 and later:
+# 
+#        frozen_delivered_to (yes)
+#               Update the local(8) delivery agent's  idea  of  the
+#               Delivered-To:     address    (see    prepend_deliv-
+#               ered_header) only once, at the start of a  delivery
+#               attempt;  do  not  update the Delivered-To: address
+#               while expanding aliases or .forward files.
+# 
+# STANDARDS
+#        RFC 822 (ARPA Internet Text Messages)
+# 
+# SEE ALSO
+#        local(8), local delivery agent
+#        newaliases(1), create/update alias database
+#        postalias(1), create/update alias database
+#        postconf(5), configuration parameters
+# 
+# README FILES
+#        Use "postconf readme_directory" or  "postconf  html_direc-
+#        tory" to locate this information.
+#        DATABASE_README, Postfix lookup table overview
+# 
+# LICENSE
+#        The  Secure  Mailer  license must be distributed with this
+#        software.
+# 
+# AUTHOR(S)
+#        Wietse Venema
+#        IBM T.J. Watson Research
+#        P.O. Box 704
+#        Yorktown Heights, NY 10598, USA
+# 
+#        Wietse Venema
+#        Google, Inc.
+#        111 8th Avenue
+#        New York, NY 10011, USA
+# 
+#                                                                     ALIASES(5)
diff --git a/etc/postfix/main.cf b/etc/postfix/main.cf
new file mode 100644
index 00000000..f5cc794d
--- /dev/null
+++ b/etc/postfix/main.cf
@@ -0,0 +1,747 @@
+# edit configs from:
+# https://wiki.archlinux.org/title/Postfix
+# GPL-3.0-only https://github.com/LukeSmithxyz/emailwiz
+# https://wiki.archlinux.org/title/OpenDMARC
+# https://wiki.archlinux.org/title/OpenDKIM
+# maybe useful things:
+# `man postconf.5`
+# print config: `postconf`
+# default config: `postconf -d`
+myhostname = mail2.flylightning.xyz
+
+# fix "relay access denied" error when receiving emails
+# I choose to follow `man postconf.5` instruction to only add $mydomain
+# emailwiz way add a lot more to mydestination, see:
+# https://github.com/LukeSmithxyz/emailwiz/pull/275
+# https://github.com/LukeSmithxyz/emailwiz/issues/265
+mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
+
+smtp_tls_security_level = may
+smtpd_tls_security_level = may
+smtpd_tls_cert_file = /etc/postfix/flylightning.pem
+smtpd_tls_key_file = /etc/postfix/flylightning.key
+
+# Here we tell Postfix to look to Dovecot for authenticating users/passwords.
+# Dovecot will be putting an authentication socket in /var/spool/postfix/private/auth
+smtpd_sasl_auth_enable = yes
+smtpd_sasl_type = dovecot
+smtpd_sasl_path = private/auth
+
+# NOTE: the trailing slash here, or for any directory name in the home_mailbox
+# command, is necessary as it distinguishes a maildir (which is the actual
+# directory that we want) from a spoolfile (which is what old unix boomers want
+# and no one else).
+home_mailbox = Mail/Inbox/
+
+# https://wiki.archlinux.org/title/OpenDKIM
+non_smtpd_milters = unix:/run/opendkim/opendkim.sock, unix:/run/opendmarc/opendmarc.sock
+smtpd_milters = unix:/run/opendkim/opendkim.sock, unix:/run/opendmarc/opendmarc.sock
+
+# more emailwiz configs, maybe useful:
+
+# TLS required for authentication.
+#smtpd_tls_auth_only = yes
+
+# Exclude insecure and obsolete encryption protocols.
+#smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
+#smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
+#smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
+#smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
+
+# helo, sender, relay and recipient restrictions
+#smtpd_sender_login_maps = pcre:/etc/postfix/login_maps.pcre
+#smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_sender_login_mismatch, reject_unknown_reverse_client_hostname, reject_unknown_sender_domain
+#smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_unknown_recipient_domain
+#smtpd_relay_restrictions = permit_sasl_authenticated, reject_unauth_destination
+#smtpd_helo_required = yes
+#smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname
+
+# Global Postfix configuration file. This file lists only a subset
+# of all parameters. For the syntax, and for a complete parameter
+# list, see the postconf(5) manual page (command: "man 5 postconf").
+#
+# TIP: use the command "postconf -n" to view main.cf parameter
+# settings, "postconf parametername" to view a specific parameter,
+# and "postconf 'parametername=value'" to set a specific parameter.
+#
+# For common configuration examples, see BASIC_CONFIGURATION_README
+# and STANDARD_CONFIGURATION_README. To find these documents, use
+# the command "postconf html_directory readme_directory", or go to
+# http://www.postfix.org/BASIC_CONFIGURATION_README.html etc.
+#
+# For best results, change no more than 2-3 parameters at a time,
+# and test if Postfix still works after every change.
+
+# COMPATIBILITY
+#
+# The compatibility_level determines what default settings Postfix
+# will use for main.cf and master.cf settings. These defaults will
+# change over time.
+#
+# To avoid breaking things, Postfix will use backwards-compatible
+# default settings and log where it uses those old backwards-compatible
+# default settings, until the system administrator has determined
+# if any backwards-compatible default settings need to be made
+# permanent in main.cf or master.cf.
+#
+# When this review is complete, update the compatibility_level setting
+# below as recommended in the RELEASE_NOTES file.
+#
+# The level below is what should be used with new (not upgrade) installs.
+#
+compatibility_level = 3.9
+
+# SOFT BOUNCE
+#
+# The soft_bounce parameter provides a limited safety net for
+# testing.  When soft_bounce is enabled, mail will remain queued that
+# would otherwise bounce. This parameter disables locally-generated
+# bounces, and prevents the SMTP server from rejecting mail permanently
+# (by changing 5xx replies into 4xx replies). However, soft_bounce
+# is no cure for address rewriting mistakes or mail routing mistakes.
+#
+#soft_bounce = no
+
+# LOCAL PATHNAME INFORMATION
+#
+# The queue_directory specifies the location of the Postfix queue.
+# This is also the root directory of Postfix daemons that run chrooted.
+# See the files in examples/chroot-setup for setting up Postfix chroot
+# environments on different UNIX systems.
+#
+queue_directory = /var/spool/postfix
+
+# The command_directory parameter specifies the location of all
+# postXXX commands.
+#
+command_directory = /usr/bin
+
+# The daemon_directory parameter specifies the location of all Postfix
+# daemon programs (i.e. programs listed in the master.cf file). This
+# directory must be owned by root.
+#
+daemon_directory = /usr/lib/postfix/bin
+
+# The data_directory parameter specifies the location of Postfix-writable
+# data files (caches, random numbers). This directory must be owned
+# by the mail_owner account (see below).
+#
+data_directory = /var/lib/postfix
+
+# QUEUE AND PROCESS OWNERSHIP
+#
+# The mail_owner parameter specifies the owner of the Postfix queue
+# and of most Postfix daemon processes.  Specify the name of a user
+# account THAT DOES NOT SHARE ITS USER OR GROUP ID WITH OTHER ACCOUNTS
+# AND THAT OWNS NO OTHER FILES OR PROCESSES ON THE SYSTEM.  In
+# particular, don't specify nobody or daemon. PLEASE USE A DEDICATED
+# USER.
+#
+mail_owner = postfix
+
+# The default_privs parameter specifies the default rights used by
+# the local delivery agent for delivery to external file or command.
+# These rights are used in the absence of a recipient user context.
+# DO NOT SPECIFY A PRIVILEGED USER OR THE POSTFIX OWNER.
+#
+#default_privs = nobody
+
+# INTERNET HOST AND DOMAIN NAMES
+# 
+# The myhostname parameter specifies the internet hostname of this
+# mail system. The default is to use the fully-qualified domain name
+# from gethostname(). $myhostname is used as a default value for many
+# other configuration parameters.
+#
+#myhostname = host.domain.tld
+#myhostname = virtual.domain.tld
+
+# The mydomain parameter specifies the local internet domain name.
+# The default is to use $myhostname minus the first component.
+# $mydomain is used as a default value for many other configuration
+# parameters.
+#
+#mydomain = domain.tld
+
+# SENDING MAIL
+# 
+# The myorigin parameter specifies the domain that locally-posted
+# mail appears to come from. The default is to append $myhostname,
+# which is fine for small sites.  If you run a domain with multiple
+# machines, you should (1) change this to $mydomain and (2) set up
+# a domain-wide alias database that aliases each user to
+# user@that.users.mailhost.
+#
+# For the sake of consistency between sender and recipient addresses,
+# myorigin also specifies the default domain name that is appended
+# to recipient addresses that have no @domain part.
+#
+#myorigin = $myhostname
+#myorigin = $mydomain
+
+# RECEIVING MAIL
+
+# The inet_interfaces parameter specifies the network interface
+# addresses that this mail system receives mail on.  By default,
+# the software claims all active interfaces on the machine. The
+# parameter also controls delivery of mail to user@[ip.address].
+#
+# See also the proxy_interfaces parameter, for network addresses that
+# are forwarded to us via a proxy or network address translator.
+#
+# Note: you need to stop/start Postfix when this parameter changes.
+#
+#inet_interfaces = all
+#inet_interfaces = $myhostname
+#inet_interfaces = $myhostname, localhost
+
+# The proxy_interfaces parameter specifies the network interface
+# addresses that this mail system receives mail on by way of a
+# proxy or network address translation unit. This setting extends
+# the address list specified with the inet_interfaces parameter.
+#
+# You must specify your proxy/NAT addresses when your system is a
+# backup MX host for other domains, otherwise mail delivery loops
+# will happen when the primary MX host is down.
+#
+#proxy_interfaces =
+#proxy_interfaces = 1.2.3.4
+
+# The mydestination parameter specifies the list of domains that this
+# machine considers itself the final destination for.
+#
+# These domains are routed to the delivery agent specified with the
+# local_transport parameter setting. By default, that is the UNIX
+# compatible delivery agent that lookups all recipients in /etc/passwd
+# and /etc/aliases or their equivalent.
+#
+# The default is $myhostname + localhost.$mydomain + localhost.  On
+# a mail domain gateway, you should also include $mydomain.
+#
+# Do not specify the names of virtual domains - those domains are
+# specified elsewhere (see VIRTUAL_README).
+#
+# Do not specify the names of domains that this machine is backup MX
+# host for. Specify those names via the relay_domains settings for
+# the SMTP server, or use permit_mx_backup if you are lazy (see
+# STANDARD_CONFIGURATION_README).
+#
+# The local machine is always the final destination for mail addressed
+# to user@[the.net.work.address] of an interface that the mail system
+# receives mail on (see the inet_interfaces parameter).
+#
+# Specify a list of host or domain names, /file/name or type:table
+# patterns, separated by commas and/or whitespace. A /file/name
+# pattern is replaced by its contents; a type:table is matched when
+# a name matches a lookup key (the right-hand side is ignored).
+# Continue long lines by starting the next line with whitespace.
+#
+# See also below, section "REJECTING MAIL FOR UNKNOWN LOCAL USERS".
+#
+#mydestination = $myhostname, localhost.$mydomain, localhost
+#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
+#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,
+#	mail.$mydomain, www.$mydomain, ftp.$mydomain
+
+# REJECTING MAIL FOR UNKNOWN LOCAL USERS
+#
+# The local_recipient_maps parameter specifies optional lookup tables
+# with all names or addresses of users that are local with respect
+# to $mydestination, $inet_interfaces or $proxy_interfaces.
+#
+# If this parameter is defined, then the SMTP server will reject
+# mail for unknown local users. This parameter is defined by default.
+#
+# To turn off local recipient checking in the SMTP server, specify
+# local_recipient_maps = (i.e. empty).
+#
+# The default setting assumes that you use the default Postfix local
+# delivery agent for local delivery. You need to update the
+# local_recipient_maps setting if:
+#
+# - You define $mydestination domain recipients in files other than
+#   /etc/passwd, /etc/aliases, or the $virtual_alias_maps files.
+#   For example, you define $mydestination domain recipients in    
+#   the $virtual_mailbox_maps files.
+#
+# - You redefine the local delivery agent in master.cf.
+#
+# - You redefine the "local_transport" setting in main.cf.
+#
+# - You use the "luser_relay", "mailbox_transport", or "fallback_transport"
+#   feature of the Postfix local delivery agent (see local(8)).
+#
+# Details are described in the LOCAL_RECIPIENT_README file.
+#
+# Beware: if the Postfix SMTP server runs chrooted, you probably have
+# to access the passwd file via the proxymap service, in order to
+# overcome chroot restrictions. The alternative, having a copy of
+# the system passwd file in the chroot jail is just not practical.
+#
+# The right-hand side of the lookup tables is conveniently ignored.
+# In the left-hand side, specify a bare username, an @domain.tld
+# wild-card, or specify a user@domain.tld address.
+# 
+#local_recipient_maps = unix:passwd.byname $alias_maps
+#local_recipient_maps = proxy:unix:passwd.byname $alias_maps
+#local_recipient_maps =
+
+# The unknown_local_recipient_reject_code specifies the SMTP server
+# response code when a recipient domain matches $mydestination or
+# ${proxy,inet}_interfaces, while $local_recipient_maps is non-empty
+# and the recipient address or address local-part is not found.
+#
+# The default setting is 550 (reject mail) but it is safer to start
+# with 450 (try again later) until you are certain that your
+# local_recipient_maps settings are OK.
+#
+unknown_local_recipient_reject_code = 550
+
+# TRUST AND RELAY CONTROL
+
+# The mynetworks parameter specifies the list of "trusted" SMTP
+# clients that have more privileges than "strangers".
+#
+# In particular, "trusted" SMTP clients are allowed to relay mail
+# through Postfix.  See the smtpd_recipient_restrictions parameter
+# in postconf(5).
+#
+# You can specify the list of "trusted" network addresses by hand
+# or you can let Postfix do it for you (which is the default).
+#
+# By default (mynetworks_style = host), Postfix "trusts" only
+# the local machine.
+# 
+# Specify "mynetworks_style = subnet" when Postfix should "trust"
+# SMTP clients in the same IP subnetworks as the local machine.
+# On Linux, this works correctly only with interfaces specified
+# with the "ifconfig" or "ip" command.
+#
+# Specify "mynetworks_style = class" when Postfix should "trust" SMTP
+# clients in the same IP class A/B/C networks as the local machine.
+# Don't do this with a dialup site - it would cause Postfix to "trust"
+# your entire provider's network.  Instead, specify an explicit
+# mynetworks list by hand, as described below.
+#  
+# Specify "mynetworks_style = host" when Postfix should "trust"
+# only the local machine.
+# 
+#mynetworks_style = class
+#mynetworks_style = subnet
+#mynetworks_style = host
+
+# Alternatively, you can specify the mynetworks list by hand, in
+# which case Postfix ignores the mynetworks_style setting.
+#
+# Specify an explicit list of network/netmask patterns, where the
+# mask specifies the number of bits in the network part of a host
+# address.
+#
+# You can also specify the absolute pathname of a pattern file instead
+# of listing the patterns here. Specify type:table for table-based lookups
+# (the value on the table right-hand side is not used).
+#
+#mynetworks = 168.100.3.0/28, 127.0.0.0/8
+#mynetworks = $config_directory/mynetworks
+#mynetworks = hash:/etc/postfix/network_table
+
+# The relay_domains parameter restricts what destinations this system will
+# relay mail to.  See the smtpd_relay_restrictions and
+# smtpd_recipient_restrictions descriptions in  postconf(5) for detailed
+# information.
+#
+# By default, Postfix relays mail
+# - from "trusted" clients (IP address matches $mynetworks, or is
+#   SASL authenticated) to any destination,
+# - from "untrusted" clients to destinations that match $relay_domains or
+#   subdomains thereof, except addresses with sender-specified routing.
+# The default relay_domains value is empty.
+# 
+# In addition to the above, the Postfix SMTP server by default accepts mail
+# that Postfix is final destination for:
+# - destinations that match $inet_interfaces or $proxy_interfaces,
+# - destinations that match $mydestination
+# - destinations that match $virtual_alias_domains,
+# - destinations that match $virtual_mailbox_domains.
+# These destinations do not need to be listed in $relay_domains.
+# 
+# Specify a list of hosts or domains, /file/name patterns or type:name
+# lookup tables, separated by commas and/or whitespace.  Continue
+# long lines by starting the next line with whitespace. A file name
+# is replaced by its contents; a type:name table is matched when a
+# (parent) domain appears as lookup key.
+#
+# NOTE: Postfix will not automatically forward mail for domains that
+# list this system as their primary or backup MX host. See the
+# permit_mx_backup restriction description in postconf(5).
+#
+#relay_domains = 
+
+# INTERNET OR INTRANET
+
+# The relayhost parameter specifies the default host to send mail to
+# when no entry is matched in the optional transport(5) table. When
+# no relayhost is given, mail is routed directly to the destination.
+#
+# On an intranet, specify the organizational domain name. If your
+# internal DNS uses no MX records, specify the name of the intranet
+# gateway host instead.
+#
+# In the case of SMTP, specify a domain, host, host:port, [host]:port,
+# [address] or [address]:port; the form [host] turns off MX lookups.
+#
+# If you're connected via UUCP, see also the default_transport parameter.
+#
+#relayhost = $mydomain
+#relayhost = [gateway.my.domain]
+#relayhost = [mailserver.isp.tld]
+#relayhost = uucphost
+#relayhost = [an.ip.add.ress]
+
+# REJECTING UNKNOWN RELAY USERS
+#
+# The relay_recipient_maps parameter specifies optional lookup tables
+# with all addresses in the domains that match $relay_domains.
+#
+# If this parameter is defined, then the SMTP server will reject
+# mail for unknown relay users. This feature is off by default.
+#
+# The right-hand side of the lookup tables is conveniently ignored.
+# In the left-hand side, specify an @domain.tld wild-card, or specify
+# a user@domain.tld address.
+# 
+#relay_recipient_maps = hash:/etc/postfix/relay_recipients
+
+# INPUT RATE CONTROL
+#
+# The in_flow_delay configuration parameter implements mail input
+# flow control. This feature is turned on by default, although it
+# still needs further development (it's disabled on SCO UNIX due
+# to an SCO bug).
+# 
+# A Postfix process will pause for $in_flow_delay seconds before
+# accepting a new message, when the message arrival rate exceeds the
+# message delivery rate. With the default 100 SMTP server process
+# limit, this limits the mail inflow to 100 messages a second more
+# than the number of messages delivered per second.
+# 
+# Specify 0 to disable the feature. Valid delays are 0..10.
+# 
+#in_flow_delay = 1s
+
+# ADDRESS REWRITING
+#
+# The ADDRESS_REWRITING_README document gives information about
+# address masquerading or other forms of address rewriting including
+# username->Firstname.Lastname mapping.
+
+# ADDRESS REDIRECTION (VIRTUAL DOMAIN)
+#
+# The VIRTUAL_README document gives information about the many forms
+# of domain hosting that Postfix supports.
+
+# "USER HAS MOVED" BOUNCE MESSAGES
+#
+# See the discussion in the ADDRESS_REWRITING_README document.
+
+# TRANSPORT MAP
+#
+# See the discussion in the ADDRESS_REWRITING_README document.
+
+# ALIAS DATABASE
+#
+# The alias_maps parameter specifies the list of alias databases used
+# by the local delivery agent. The default list is system dependent.
+#
+# On systems with NIS, the default is to search the local alias
+# database, then the NIS alias database. See aliases(5) for syntax
+# details.
+# 
+# If you change the alias database, run "postalias /etc/aliases" (or
+# wherever your system stores the mail alias file), or simply run
+# "newaliases" to build the necessary DBM or DB file.
+#
+# It will take a minute or so before changes become visible.  Use
+# "postfix reload" to eliminate the delay.
+#
+#alias_maps = dbm:/etc/aliases
+#alias_maps = hash:/etc/aliases
+#alias_maps = hash:/etc/aliases, nis:mail.aliases
+#alias_maps = netinfo:/aliases
+alias_maps = lmdb:/etc/postfix/aliases
+
+# The alias_database parameter specifies the alias database(s) that
+# are built with "newaliases" or "sendmail -bi".  This is a separate
+# configuration parameter, because alias_maps (see above) may specify
+# tables that are not necessarily all under control by Postfix.
+#
+#alias_database = dbm:/etc/aliases
+#alias_database = dbm:/etc/mail/aliases
+#alias_database = hash:/etc/aliases
+#alias_database = hash:/etc/aliases, hash:/opt/majordomo/aliases
+alias_database = $alias_maps
+
+# ADDRESS EXTENSIONS (e.g., user+foo)
+#
+# The recipient_delimiter parameter specifies the separator between
+# user names and address extensions (user+foo). See canonical(5),
+# local(8), relocated(5) and virtual(5) for the effects this has on
+# aliases, canonical, virtual, relocated and .forward file lookups.
+# Basically, the software tries user+foo and .forward+foo before
+# trying user and .forward.
+#
+#recipient_delimiter = +
+
+# DELIVERY TO MAILBOX
+#
+# The home_mailbox parameter specifies the optional pathname of a
+# mailbox file relative to a user's home directory. The default
+# mailbox file is /var/spool/mail/user or /var/mail/user.  Specify
+# "Maildir/" for qmail-style delivery (the / is required).
+#
+#home_mailbox = Mailbox
+#home_mailbox = Maildir/
+ 
+# The mail_spool_directory parameter specifies the directory where
+# UNIX-style mailboxes are kept. The default setting depends on the
+# system type.
+#
+#mail_spool_directory = /var/mail
+#mail_spool_directory = /var/spool/mail
+
+# The mailbox_command parameter specifies the optional external
+# command to use instead of mailbox delivery. The command is run as
+# the recipient with proper HOME, SHELL and LOGNAME environment settings.
+# Exception:  delivery for root is done as $default_privs.
+#
+# Other environment variables of interest: USER (recipient username),
+# EXTENSION (address extension), DOMAIN (domain part of address),
+# and LOCAL (the address localpart).
+#
+# Unlike other Postfix configuration parameters, the mailbox_command
+# parameter is not subjected to $parameter substitutions. This is to
+# make it easier to specify shell syntax (see example below).
+#
+# Avoid shell meta characters because they will force Postfix to run
+# an expensive shell process. Procmail alone is expensive enough.
+#
+# IF YOU USE THIS TO DELIVER MAIL SYSTEM-WIDE, YOU MUST SET UP AN
+# ALIAS THAT FORWARDS MAIL FOR ROOT TO A REAL USER.
+#
+#mailbox_command = /some/where/procmail
+#mailbox_command = /some/where/procmail -a "$EXTENSION"
+
+# The mailbox_transport specifies the optional transport in master.cf
+# to use after processing aliases and .forward files. This parameter
+# has precedence over the mailbox_command, fallback_transport and
+# luser_relay parameters.
+#
+# Specify a string of the form transport:nexthop, where transport is
+# the name of a mail delivery transport defined in master.cf.  The
+# :nexthop part is optional. For more details see the sample transport
+# configuration file.
+#
+# NOTE: if you use this feature for accounts not in the UNIX password
+# file, then you must update the "local_recipient_maps" setting in
+# the main.cf file, otherwise the SMTP server will reject mail for    
+# non-UNIX accounts with "User unknown in local recipient table".
+#
+# Cyrus IMAP over LMTP. Specify ``lmtpunix      cmd="lmtpd"
+# listen="/var/imap/socket/lmtp" prefork=0'' in cyrus.conf.
+#mailbox_transport = lmtp:unix:/var/imap/socket/lmtp
+#
+# Cyrus IMAP via command line. Uncomment the "cyrus...pipe" and
+# subsequent line in master.cf.
+#mailbox_transport = cyrus
+
+# The fallback_transport specifies the optional transport in master.cf
+# to use for recipients that are not found in the UNIX passwd database.
+# This parameter has precedence over the luser_relay parameter.
+#
+# Specify a string of the form transport:nexthop, where transport is
+# the name of a mail delivery transport defined in master.cf.  The
+# :nexthop part is optional. For more details see the sample transport
+# configuration file.
+#
+# NOTE: if you use this feature for accounts not in the UNIX password
+# file, then you must update the "local_recipient_maps" setting in
+# the main.cf file, otherwise the SMTP server will reject mail for    
+# non-UNIX accounts with "User unknown in local recipient table".
+#
+#fallback_transport = lmtp:unix:/file/name
+#fallback_transport = cyrus
+#fallback_transport =
+
+# The luser_relay parameter specifies an optional destination address
+# for unknown recipients.  By default, mail for unknown@$mydestination,
+# unknown@[$inet_interfaces] or unknown@[$proxy_interfaces] is returned
+# as undeliverable.
+#
+# The following expansions are done on luser_relay: $user (recipient
+# username), $shell (recipient shell), $home (recipient home directory),
+# $recipient (full recipient address), $extension (recipient address
+# extension), $domain (recipient domain), $local (entire recipient
+# localpart), $recipient_delimiter. Specify ${name?value} or
+# ${name:value} to expand value only when $name does (does not) exist.
+#
+# luser_relay works only for the default Postfix local delivery agent.
+#
+# NOTE: if you use this feature for accounts not in the UNIX password
+# file, then you must specify "local_recipient_maps =" (i.e. empty) in
+# the main.cf file, otherwise the SMTP server will reject mail for    
+# non-UNIX accounts with "User unknown in local recipient table".
+#
+#luser_relay = $user@other.host
+#luser_relay = $local@other.host
+#luser_relay = admin+$local
+  
+# JUNK MAIL CONTROLS
+# 
+# The controls listed here are only a very small subset. The file
+# SMTPD_ACCESS_README provides an overview.
+
+# The header_checks parameter specifies an optional table with patterns
+# that each logical message header is matched against, including
+# headers that span multiple physical lines.
+#
+# By default, these patterns also apply to MIME headers and to the
+# headers of attached messages. With older Postfix versions, MIME and
+# attached message headers were treated as body text.
+#
+# For details, see "man header_checks".
+#
+#header_checks = regexp:/etc/postfix/header_checks
+
+# FAST ETRN SERVICE
+#
+# Postfix maintains per-destination logfiles with information about
+# deferred mail, so that mail can be flushed quickly with the SMTP
+# "ETRN domain.tld" command, or by executing "sendmail -qRdomain.tld".
+# See the ETRN_README document for a detailed description.
+# 
+# The fast_flush_domains parameter controls what destinations are
+# eligible for this service. By default, they are all domains that
+# this server is willing to relay mail to.
+# 
+#fast_flush_domains = $relay_domains
+
+# SHOW SOFTWARE VERSION OR NOT
+#
+# The smtpd_banner parameter specifies the text that follows the 220
+# code in the SMTP server's greeting banner. Some people like to see
+# the mail version advertised. By default, Postfix shows no version.
+#
+# You MUST specify $myhostname at the start of the text. That is an
+# RFC requirement. Postfix itself does not care.
+#
+#smtpd_banner = $myhostname ESMTP $mail_name
+#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
+
+# PARALLEL DELIVERY TO THE SAME DESTINATION
+#
+# How many parallel deliveries to the same user or domain? With local
+# delivery, it does not make sense to do massively parallel delivery
+# to the same user, because mailbox updates must happen sequentially,
+# and expensive pipelines in .forward files can cause disasters when
+# too many are run at the same time. With SMTP deliveries, 10
+# simultaneous connections to the same domain could be sufficient to
+# raise eyebrows.
+# 
+# Each message delivery transport has its XXX_destination_concurrency_limit
+# parameter.  The default is $default_destination_concurrency_limit for
+# most delivery transports. For the local delivery agent the default is 2.
+
+#local_destination_concurrency_limit = 2
+#default_destination_concurrency_limit = 20
+
+# DEBUGGING CONTROL
+#
+# The debug_peer_level parameter specifies the increment in verbose
+# logging level when an SMTP client or server host name or address
+# matches a pattern in the debug_peer_list parameter.
+#
+debug_peer_level = 2
+
+# The debug_peer_list parameter specifies an optional list of domain
+# or network patterns, /file/name patterns or type:name tables. When
+# an SMTP client or server host name or address matches a pattern,
+# increase the verbose logging level by the amount specified in the
+# debug_peer_level parameter.
+#
+#debug_peer_list = 127.0.0.1
+#debug_peer_list = some.domain
+
+# The debugger_command specifies the external command that is executed
+# when a Postfix daemon program is run with the -D option.
+#
+# Use "command .. & sleep 5" so that the debugger can attach before
+# the process marches on. If you use an X-based debugger, be sure to
+# set up your XAUTHORITY environment variable before starting Postfix.
+#
+debugger_command =
+	 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
+	 ddd $daemon_directory/$process_name $process_id & sleep 5
+
+# If you can't use X, use this to capture the call stack when a
+# daemon crashes. The result is in a file in the configuration
+# directory, and is named after the process name and the process ID.
+#
+# debugger_command =
+#	PATH=/bin:/usr/bin:/usr/local/bin; export PATH; (echo cont;
+#	echo where) | gdb $daemon_directory/$process_name $process_id 2>&1
+#	>$config_directory/$process_name.$process_id.log & sleep 5
+#
+# Another possibility is to run gdb under a detached screen session.
+# To attach to the screen session, su root and run "screen -r
+# <id_string>" where <id_string> uniquely matches one of the detached
+# sessions (from "screen -list").
+#
+# debugger_command =
+#	PATH=/bin:/usr/bin:/sbin:/usr/sbin; export PATH; screen
+#	-dmS $process_name gdb $daemon_directory/$process_name
+#	$process_id & sleep 1
+
+# INSTALL-TIME CONFIGURATION INFORMATION
+#
+# The following parameters are used when installing a new Postfix version.
+# 
+# sendmail_path: The full pathname of the Postfix sendmail command.
+# This is the Sendmail-compatible mail posting interface.
+# 
+sendmail_path = /usr/bin/sendmail
+
+# newaliases_path: The full pathname of the Postfix newaliases command.
+# This is the Sendmail-compatible command to build alias databases.
+#
+newaliases_path = /usr/bin/newaliases
+
+# mailq_path: The full pathname of the Postfix mailq command.  This
+# is the Sendmail-compatible mail queue listing command.
+# 
+mailq_path = /usr/bin/mailq
+
+# setgid_group: The group for mail submission and queue management
+# commands.  This must be a group name with a numerical group ID that
+# is not shared with other accounts, not even with the Postfix account.
+#
+setgid_group = postdrop
+
+# html_directory: The location of the Postfix HTML documentation.
+#
+html_directory = no
+
+# manpage_directory: The location of the Postfix on-line manual pages.
+#
+manpage_directory = /usr/share/man
+
+# sample_directory: The location of the Postfix sample configuration files.
+# This parameter is obsolete as of Postfix 2.1.
+#
+sample_directory = /etc/postfix
+
+# readme_directory: The location of the Postfix README files.
+#
+readme_directory = /usr/share/doc/postfix
+inet_protocols = ipv4
+shlib_directory = /usr/lib/postfix
+meta_directory = /etc/postfix
diff --git a/etc/postfix/master.cf b/etc/postfix/master.cf
new file mode 100644
index 00000000..46ed0b73
--- /dev/null
+++ b/etc/postfix/master.cf
@@ -0,0 +1,150 @@
+# I follow these guides:
+# https://wiki.archlinux.org/title/Postfix#Secure_SMTP_(receiving)
+
+#
+# Postfix master process configuration file.  For details on the format
+# of the file, see the master(5) manual page (command: "man 5 master" or
+# on-line: http://www.postfix.org/master.5.html).
+#
+# Do not forget to execute "postfix reload" after editing this file.
+#
+# ==========================================================================
+# service type  private unpriv  chroot  wakeup  maxproc command + args
+#               (yes)   (yes)   (no)    (never) (100)
+# ==========================================================================
+smtp      inet  n       -       n       -       -       smtpd
+#smtp      inet  n       -       n       -       1       postscreen
+#smtpd     pass  -       -       n       -       -       smtpd
+#dnsblog   unix  -       -       n       -       0       dnsblog
+#tlsproxy  unix  -       -       n       -       0       tlsproxy
+# Choose one: enable submission for loopback clients only, or for any client.
+#127.0.0.1:submission inet n -   n       -       -       smtpd
+submission inet n       -       n       -       -       smtpd
+  -o syslog_name=postfix/submission
+  -o smtpd_tls_security_level=encrypt
+  -o smtpd_sasl_auth_enable=yes
+  -o smtpd_tls_auth_only=yes
+#  -o local_header_rewrite_clients=static:all
+  -o smtpd_reject_unlisted_recipient=no
+#     Instead of specifying complex smtpd_<xxx>_restrictions here,
+#     specify "smtpd_<xxx>_restrictions=$mua_<xxx>_restrictions"
+#     here, and specify mua_<xxx>_restrictions in main.cf (where
+#     "<xxx>" is "client", "helo", "sender", "relay", or "recipient").
+#  -o smtpd_client_restrictions=
+#  -o smtpd_helo_restrictions=
+#  -o smtpd_sender_restrictions=
+  -o smtpd_relay_restrictions=
+  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
+  -o milter_macro_daemon_name=ORIGINATING
+# Choose one: enable submissions for loopback clients only, or for any client.
+#127.0.0.1:submissions inet n  -       n       -       -       smtpd
+submissions     inet  n       -       n       -       -       smtpd
+  -o syslog_name=postfix/submissions
+  -o smtpd_tls_wrappermode=yes
+  -o smtpd_sasl_auth_enable=yes
+#  -o local_header_rewrite_clients=static:all
+  -o smtpd_reject_unlisted_recipient=no
+#     Instead of specifying complex smtpd_<xxx>_restrictions here,
+#     specify "smtpd_<xxx>_restrictions=$mua_<xxx>_restrictions"
+#     here, and specify mua_<xxx>_restrictions in main.cf (where
+#     "<xxx>" is "client", "helo", "sender", "relay", or "recipient").
+#  -o smtpd_client_restrictions=
+#  -o smtpd_helo_restrictions=
+#  -o smtpd_sender_restrictions=
+  -o smtpd_relay_restrictions=
+  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
+  -o milter_macro_daemon_name=ORIGINATING
+#628       inet  n       -       n       -       -       qmqpd
+pickup    unix  n       -       n       60      1       pickup
+cleanup   unix  n       -       n       -       0       cleanup
+qmgr      unix  n       -       n       300     1       qmgr
+#qmgr     unix  n       -       n       300     1       oqmgr
+tlsmgr    unix  -       -       n       1000?   1       tlsmgr
+rewrite   unix  -       -       n       -       -       trivial-rewrite
+bounce    unix  -       -       n       -       0       bounce
+defer     unix  -       -       n       -       0       bounce
+trace     unix  -       -       n       -       0       bounce
+verify    unix  -       -       n       -       1       verify
+flush     unix  n       -       n       1000?   0       flush
+proxymap  unix  -       -       n       -       -       proxymap
+proxywrite unix -       -       n       -       1       proxymap
+smtp      unix  -       -       n       -       -       smtp
+relay     unix  -       -       n       -       -       smtp
+        -o syslog_name=${multi_instance_name?{$multi_instance_name}:{postfix}}/$service_name
+#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
+showq     unix  n       -       n       -       -       showq
+error     unix  -       -       n       -       -       error
+retry     unix  -       -       n       -       -       error
+discard   unix  -       -       n       -       -       discard
+local     unix  -       n       n       -       -       local
+virtual   unix  -       n       n       -       -       virtual
+lmtp      unix  -       -       n       -       -       lmtp
+anvil     unix  -       -       n       -       1       anvil
+scache    unix  -       -       n       -       1       scache
+postlog   unix-dgram n  -       n       -       1       postlogd
+#
+# ====================================================================
+# Interfaces to non-Postfix software. Be sure to examine the manual
+# pages of the non-Postfix software to find out what options it wants.
+#
+# Many of the following services use the Postfix pipe(8) delivery
+# agent.  See the pipe(8) man page for information about ${recipient}
+# and other message envelope options.
+# ====================================================================
+#
+# maildrop. See the Postfix MAILDROP_README file for details.
+# Also specify in main.cf: maildrop_destination_recipient_limit=1
+#
+#maildrop  unix  -       n       n       -       -       pipe
+#  flags=DRXhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
+#
+# ====================================================================
+#
+# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
+#
+# Specify in cyrus.conf:
+#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
+#
+# Specify in main.cf one or more of the following:
+#  mailbox_transport = lmtp:inet:localhost
+#  virtual_transport = lmtp:inet:localhost
+#
+# ====================================================================
+#
+# Cyrus 2.1.5 (Amos Gouaux)
+# Also specify in main.cf: cyrus_destination_recipient_limit=1
+#
+#cyrus     unix  -       n       n       -       -       pipe
+#  flags=DRX user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
+#
+# ====================================================================
+#
+# Old example of delivery via Cyrus.
+#
+#old-cyrus unix  -       n       n       -       -       pipe
+#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
+#
+# ====================================================================
+#
+# See the Postfix UUCP_README file for configuration details.
+#
+#uucp      unix  -       n       n       -       -       pipe
+#  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
+#
+# ====================================================================
+#
+# Other external delivery methods.
+#
+#ifmail    unix  -       n       n       -       -       pipe
+#  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
+#
+#bsmtp     unix  -       n       n       -       -       pipe
+#  flags=Fq. user=bsmtp argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient
+#
+#scalemail-backend unix -       n       n       -       2       pipe
+#  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store
+#  ${nexthop} ${user} ${extension}
+#
+#mailman   unix  -       n       n       -       -       pipe
+#  flags=FRX user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
+#  ${nexthop} ${user}