postfix not accepting mails from few domains

by Arany Péter   Last Updated December 13, 2017 17:00 PM - source

I have a problem with postfix. Our server not accepting the emails from a domains.

On the receiver server logs I see:

 postfix/smtpd[4533]: improper command pipelining after DATA from mail.domain.hu[IP address]:
postfix/smtpd[4533]: lost connection after DATA (0 bytes) from mail.domain.hu[IP address]

On the sending server logs (it uses exim4):

 R=lookuphost T=remote_smtp defer (110): Connection timed out: SMTP timeout while connected to domain [IP]

Does anyone have a suggestion what can cause a problem like this? Can a bad (self-signed) SSL cert on the receiving server cause this?

Tags : postfix fail2ban


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