Issue Plesk 18.0.73 - postfix/smtpd fatal: no SASL authentication mechanisms

[LRLD]

Server operating system version

Ubuntu 24.04.3 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.73 Web Pro Edition

Morning,

I was just sending a test mail on my systems to make sure everything was ok after the Dovecot update, only to find my mail being held in the queue.
I see lots of...mail postfix/smtpd[3261]: fatal: no SASL authentication mechanisms in the mail.err log since the update to 18.0.73 yesterday.
Looking at the /etc/postfix/sasl/smtpd.conf file, showed just PLAIN LOGIN so I had to add back in DIGEST-MD5 CRAM-MD5 so the file looked like this again...

pwcheck_method: auxprop saslauthd
auxprop_plugin: plesk
saslauthd_path: /private/plesk_saslauthd
mech_list: DIGEST-MD5 CRAM-MD5 PLAIN LOGIN
sql_engine: intentionally disabled
log_level: 4

I hope this helps the next person.
Regards

LD

 

[Linulex]

Thank you LD,

that helped an is the solution, but on almalinux ( and other redhat derived systems ) the smtpd.conf is in

/etc/sasl2/smtpd.conf

I had the same problem, port 465 refused an encrypted password saying the server doesn't support that.

The fix is the same

Regards
Jan