Hello, When I look at my mail.warn file (log level warn or greater), or grep mail.log for warning messages, I am presented with a flood of 'Name or service not known', 'address not listed for hostname', and 'numeric hostname' messages. I run a small site yet mail.warn log has 16k lines since yesterday and 14k of them are one of the those messages.
I've read that "many Postfix access control mechanisms depend on the client hostname" and I can appreciate the utility of them in a log next to the check that may be failing. That is why I am not enabling "smtpd_peername_lookup = no". I just wish these messages weren't emitted as warnings but instead at some lower log level, perhaps even controllable via some smtpd_dns_logas parameter. I am just throwing this out as something to consider. Perhaps these messages must be warning level and It may not be worth the trouble of documenting or maintaining a new feature. I just installed syslog-ng and am using it's filter match facility to keep those messages out of my mail.warn log. Thank you for a great email system, -- Jacob
