Wietse Venema:
> Sorry, my initial diagnosis was incorrect.
>
> Stefan Foerster:
> > postfix/submission/smtpd[156]: warning: host or service dovecot:12345 not
> > found: Name does not resolve
> > postfix/submission/smtpd[156]: warning: SASL: Connect to Dovecot auth
> > socket 'inet:dovecot:12345' failed: Address not available
>
> You already have the fix 20220404. That fix changed a fatal error
> into a warning, and returns an EADDRNOTAVAIL error.
>
> > postfix/submission/smtpd[156]: fatal: no SASL authentication mechanisms
>
> The server needs to announce the SASL mechanisms in the EHLO response.
> If it cannot reply to EHLO, then I don't see what good it does if
> we make this a non-fatal error.
If an SMTP client does not need to authenticate with SASL, then the
usual practice is to connect to the MTA service on port 25, instead
of the MUA service on the submission port.
Wietse
