On 5/6/2013 6:54 PM, /dev/rob0 wrote: > FCrDNS itself is not just a best practice, it is a > requirement.
It is preferred, but optional, not required. If it was a *requirement* then Postfix would have neither of these two restrictions, and the first would simply be hard coded into postscreen and smtpd. reject_unknown_client_hostname reject_unkown_reverse_client_hostname Obviously it is not. In addition, if FCrDNS was indeed a requirement, then nobody would accept mail from my SOHO Postfix server, nor any mail servers behind the tens of thousands of "business class" ADSL circuits in the US which offer static IPs but not custom rDNS. You yourself accept mail from my outbound, so obviously you're not strictly enforcing FCrDNS. That or you've manually whitelisted my IP. -- Stan
