I would like to turn off this warning Postfix warning:
Apr 4 19:03:54 cm postfix/smtpd: warning: x18.104.22.168: hostname x1-208-40-68.mxxx.net verification failed: Name or service not known
The reason why I want to turn off this warning is I get 80 messages every minute on this mail server and my egrep command is picking up too much information. I would rather Postfix not report this warning so that I can focus on the important warning generated from systems elsewhere.
tail -f /usr/local/psa/var/log/maillog | egrep -i "unable|failed|refused|error|warning"
From what I understand from this post, the warning appears because there is no proper reverse (PTR) record for this host. See here:
Using Webmin I find setting under SMTP Authentication And Encryption,
"Reject clients with no reverse hostname". This appears to be a matching setting in case I actually wanted to reject those clients. Could someone confirm? Again, my aim is not to reject these clients. I just want to turn off the warnings.