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.

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