Lack of info in the logs, unable to find the reason of 550 error

[georgy.goshin]

Hello!

I've a trouble receiving mails from only one mail server and can't get any reason why. Logs shows only CONNECT and DISCONNECT. Client receives 550 error.

Is there a way to increase the log level?

cleint see only this "Remote Server returned '554 5.0.0 <s*.*.ee #5.0.0>"

In my logs I see only this

Feb 15 18:44:32 spam03 postfix/postscreen[155223]: CONNECT from [78.A.B.135]:46946 to [92.X.Y.126]:25
Feb 15 18:44:32 spam03 postfix/postscreen[155223]: WHITELISTED [78.A.B.135]:46946
Feb 15 18:44:32 spam03 postfix/smtpd[173409]: connect from www481.SOMESERVER.de[78.A.B.135]
Feb 15 18:44:32 spam03 postfix/smtpd[173409]: disconnect from www481.SOMESERVER.de[78.A.B.135] ehlo=1 quit=1 commands=2

How to get more info from postfix?

 

[Stoiko Ivanov]

Client receives 550 error.

what is the client in this context? www481.SOMESERVER.de ?

In any case - you can enable verbose logging for the smtpd processes (either the one one the external, or the internal port) as described in:
https://www.postfix.org/DEBUG_README.html#verbose

in PMG you need to use the templateing system to adapt the postfix config:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmgconfig_template_engine

I hope this helps!