Finally gave in and wrote some Postfix rules to route SMTP traffic for *.outlook.com hosted domains (basically any school or government I email) through IPv4 instead of IPv6 to stop being blocked by Spamhaus false positives on "my" shared v6/64. #IPv6 #SpamHaus #Postfix

Y-en-a-t-il parmi vous qui ont mis en place dans #postfix un système de liste blanche de correspondants par utilisateur.

On a des clients qui utilisent Mailinblack et qui apprécient le système de captcha envoyé automatiquement en réponse aux expéditeurs inconnus.

Il doit y avoir moyen de faire quelque chose de similaire avec milter et/ou sieve

Nos boites mails sont administrées avec ISPConfig

Just going through the logs of my own mail server (Thanks, @mwl !) to extend my #postfix #fail2ban #regexp to ban hosts with too many unsuccesful login attempts. Knowing the user name pattern (example.com only letters, others with at least one dot) I came up with

'warning: .*\[<HOST>\]: SASL LOGIN authentication failed: .*sasl_username=<F-USER>(?:[^.]*@(?!example\.com)|[^.]*\.[^.]*@(?:example\.com))</F-USER>'

This works great.

This weekend's project:
Replaced my #Postfix #MTA #mailserver with a new one. I had been running a #Ubuntu based one since 2020, and it didn't deal well with an in-place upgrade.

New machine set up on #Debian 12, with a bunch of tips stolen from @mwl 's book Run Your Own Mail Server and from https://workaround.org/ispmail-bookworm/

Sysadmins del fediverso, que score usan para Spamassassin? #spam #spamassassin #sysadmin #correo #email #postfix #dovecot

#sysAdmin #Postfix
Ah, je viens d'avoir le "unexpected attribute smtputf8 from xxx socket (expecting: sendopts)" Voilà ce qui arrive quand on ne lit pas les release notes.
(Executive summary : redémarrez Postfix.)

Why can't I get a Docker container (using docker-compose) to access Postfix running on the host on port 25?

I must be missing something, obviously

Any takers?

#fedihelp , please: I'm #selfhosting #dovecot and #postfix and running out of disk space with my mails reaching back into last century. I'd like to remove the oldest ones and keep an archive of any kind on a different host. What would be the easiest way to achieve that?
Maybe just imap-sync to some special maildir?

Edit:typo

Software that just works: #monit has been running for years, only sending me messages when something has triggered. I had forgotten it uses #postfix to deliver mail. I didn't know I had a mail server anymore :-). #Apache2 needed a restart after 8 years or so (haven't checked, maybe it is just 5), there was a memory leak somewhere.