Patrick Mahan: > FreeBSD 11.2, Postfix 3.3.2, Dovecot 2.3.4 > > Random user verification failures are occurring and I am not sure why. > > Here's an example - > > >From /var/log/maillog: > > Failure: > > Jan 21 12:20:41 ns postfix/smtpd[31736]: NOQUEUE: reject: RCPT from > mta2.email.famousfootwear.com[136.147.183.86]: 450 4.1.1 <tr...@mahan.org>: > Recipient address rejected: unverified address: unknown mail transport
http://www.postfix.org/DEBUG_README.html#logging Look for obvious signs of trouble Postfix logs all failed and successful deliveries to a logfile. The file is usually called /var/log/maillog or /var/log/mail; the exact pathname is defined in the /etc/syslog.conf file. When Postfix does not receive or deliver mail, the first order of business is to look for errors that prevent Postfix from working properly: % egrep '(warning|error|fatal|panic):' /some/log/file | more Note: the most important message is near the BEGINNING of the output. Error messages that come later are less useful.