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Details see `man postconf.5`. It seems smtpd_hide_client_session config
for port 25 smtp MTA this must be no, port 587 and 465 (submission and
submissions) MTU can be set to yes in master.cf. Port 25 smtp MTA
receives messages from others to me. Port 587 and 465 (submission and
submissions) MTU receives messages from me to others. main.cf is configs
for all. master.cf I can set configs specifically to submission and
submissions.
Before, when others receives my email that send from my laptop, it will
leak my laptop's hostname and ip in one of its `Received` header like
`Received: from <my-hostname> (<my-domain-name> [<my-ip>]) by
mail.flylightning.xyz ...`. After set smtpd_hide_client_session to yes,
that line changed to `Received: by mail.flylightning.xyz ...`, note
there's no `from ...` that leaks my ip.
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Sometimes, there's a new route appear in my `ip -6 r`:
default nhid 715021918 via fe80::284:e5ff:fe28:829d dev eth0 proto ra metric 1024 expires 24sec pref medium
There's also these lines appear in my `ip -a`:
inet6 2606:a8c0:3:8cd:246:d3ff:fed8:155d/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 86398sec preferred_lft 14398sec
It seems sometimes Crunchbits maybe send some ipv6 RA (router
advertisement) message to my VPS and cause my VPS to add these lines.
This will break ipv6 of my VPS. I searched online, it seems I can use
`IPv6AcceptRA=false` in my systemd network config file, and it fixed the
issue. Not sure if this is the correct way. I also don't quite
understand RA.
Maybe another way to fix the issue is to accept RA and let is to
configure my ipv6 correctly somehow. But this RA message only appears
sometimes and not always. So I think just disable it maybe is a better
way.
More links related to RA: https://unix.stackexchange.com/q/766565
https://unix.stackexchange.com/q/639260
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sure how or why
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https://gitlab.archlinux.org/archlinux/packaging/packages/pacman/-/commit/f02d4d01cc9bcaf566e72dbb769250f8c2752e9e
https://gitlab.archlinux.org/pacman/pacman/-/commit/71764b6d4cdee1f74cfc603050ced59009950169
https://gitlab.archlinux.org/archlinux/packaging/packages/pacman/-/commit/319671cc720a31cfaa81e25354d58699a1bedf6c
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Commit
https://gitlab.archlinux.org/pacman/pacman/-/commit/71764b6d4cdee1f74cfc603050ced59009950169
and
https://gitlab.archlinux.org/archlinux/packaging/packages/pacman/-/commit/099295fdcb33c875d0659510dc8e82969463a7c4
migrate rustflags to /etc/makepkg.conf.d/rust.conf.
Note I also change opt-level to 3 because
https://doc.rust-lang.org/cargo/reference/profiles.html shows opt-level
3 is all optimization which I want.
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backup it so maybe keep it longer
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dovecot no auto delete Junk, read junk first to determine if it is spam.
Trash only auto delete after 10 days, because consider in the future I
may only do backup weekly, 10 days can make sure it is backuped.
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postfix log warning "/etc/postfix/main.cf: support for parameter
"smtpd_use_tls" will be removed; instead, specify
"smtpd_tls_security_level"". I am already using
smtpd_tls_security_level, so I just removed smtpd_use_tls. Also see
https://github.com/LukeSmithxyz/emailwiz/issues/112
`man 5 postconf` has documentation about smtpd_tls_security_level
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thus no need"
This reverts commit 9afc357eb6480d57b71762567690ebe46d01a3ec.
Because crunchbits Arch Linux cloud init auto install deafult symlink to
Europe/London timezone which is different from UTC. I want UTC. So I
choose to always symlink timezome to prevent similar things happen again.
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If client use alacritty, after ssh into this remote server, ls doesn't
show color. Can be workarounded by server sshd accept COLORTERM and
client sshd send env. More see my comments in alacritty.toml config.
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It seems move 2606:a8c0:3::75f in front of 2606:a8c0:3:773::a will make the latter default?
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