Snel.com - Yavuz Ayd?n: > I think Postfix checks the parent domain or POstfix just connects back > to the connecting mailserver to do the check (which would pass).
No, that would be immensely stupid, especially if the email address is not remote. Postfix probes follow the same path that ordinary email would follow, including transport_maps, MX resolution, or local delivery. It uses the same delivery processes for probes and ordinary email. Some might consider that a revolutionary concept, but it makes the result more realistic. > My questions: > 1. How do I debug this? Postfix logs every transaction including probes. DO NOT turn on verbose (debug) logging. That just makes the information you need harder to find. Wietse