Mark Johnson wrote: > All, > We have an application server to generate mail and use postfix as relay mail > server for outgoing mail. We ran the test and postfix did catch the error. > However, it didn't report back to application server. > We used sendmail as relay mail server and it did report back to application > server. > > Any suggestion is appreciated? > > Here is the mail log: > Oct 9 10:17:34 smtpmailer postfix/smtp[27126]: 47E79249AA4: > to=<i...@mydomain.com.us>, relay=none, delay=20, delays=0.07/0/20/0, > dsn=4.4.3, status=deferred (Host or domain name not found. Name service error > for name=varsitygold.com type=MX: Host not found, try again) > Oct 9 10:17:34 smtpmailer postfix/smtp[27128]: 5813B249AA6: > to=<t...@mydomain.com.us>, relay=none, delay=20, delays=0.07/0.01/20/0, > dsn=4.4.3, status=deferred (Host or domain name not found. Name service error > for name=varsitygold.com type=MX: Host not found, try again) > >
With no 'postconf -n', I can only guess. <taps crystal ball> I'm guessing this is a non-existent domain. Postfix accepted it because it was sent from within permit_mynetworks. Postfix will bounce it after maximal_queue_lifetime (default 5 days). If you wish to reject/defer initially, you need to add reject_unknown_recipient_domain before permit_mynetworks in smtpd_recipient_restrictions. Note: reject_unknown_recipient_domain is subject to transient DNS issues. It is highly recommend to have a local, caching DNS server. </taps crystal ball>
