submission server fails to relay messages

[Aki Tuomi]

> On 13/09/2021 20:05 Шварц Сергей Владимирович <svschwartz at gmail.com> wrote:
> 
> 
> Hi guys!
> 
> I'm using dovecot submission server for clients to send emails and relay them to postfix. Everything works fine unless a client tries to send large (40Mbs) messages. No big deal one can say just set "message_size_limit = 314572800" in postfix and it should just work, but no, it does not, client gets "552 5.2.3 Message size exceeds administrative limit.". I've increased verbosity for smtpd process and get this logs for a failed attempt
> 

<snip/>

> if I configure imap client /Thunderbird to connect directly to postfix everything works just fine.
> 
> doveconf -n output is attached just in case

Try adding

log_debug=category=smtp-client or category=smtp-server or category=smtp-submit

to your dovecot.conf and see if you could get some logs?

Aki