On Wed, Feb 04, 2026 at 10:18:00AM -0500, Dennis Putnam via Postfix-users wrote:
> > It may be time for more debugging info. You could always add a -v
> > parameter to the smtp service in master.cf that will give you more
> > verbose info (so long as this is a server where you can safely do this
> > kind of debugging)
> >
> > smtp unix - - n - - smtp -v
> >
> > That will certainly show the smtp session including which user is being
> > used for authentication and the result.
That's the master.cf entry for the Postfix SMTP CLIENT (smtp(8)), not
the Postfix SMTP server (smtpd(8)). See side-by-side definitions below:
$ postconf -c ~/dev/postfix/postfix/conf -Mf 'smtp/*'
smtp inet n - n - - smtpd
smtp unix - - n - - smtp
> After resolving a higher priority problem, I am back to this one. I've added
> the -v option but I'm not sure exactly what to look for. I do see something
> suspicious.
You've added the "-v" to the wrong service:
> 2026-02-03T14:48:59.408005-05:00 dap002 postfix/smtpd[142495]: >>> CHECKING
> Recipient address VALIDATION MAPS <<<
Don't confuse the SMTP delivery agent (SMTP client) "smtp/unix" (daemon
program smtp(8)), with the port 25 SMTP listener (SMTP server)
"smtp/inet" (daemon program smtpd(8)).
--
Viktor. 🇺🇦 Слава Україні!
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