regarding rejected incoming mail - how to find out which "rule" is responsible

hello,

here is the mail log for a legitimate mail that my server rejected:

here is a an excerpt from my main.cf:

 

I think it's reject_unknown_hostname in your smtpd_recipient_restrictions.

 

I took it out, restarted postfix, and will ask that guy to resend his email to see it its ok now.

 

you were right. that was the offending rule.