On 2/5/2026 10:24 AM, Dennis Putnam wrote:
On 2/4/2026 8:50 PM, Viktor Dukhovni via Postfix-users wrote: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 -vThat will certainly show the smtp session including which user is beingused 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 - - smtpAfter 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 somethingsuspicious.You've added the "-v" to the wrong service:2026-02-03T14:48:59.408005-05:00 dap002 postfix/smtpd[142495]: >>> CHECKINGRecipient 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)).This line: smtp unix - - n - - smtpis commented out in my master.cf. I didn't realize they were 2 different things. I'll uncomment it and collect the data again.
My bad. I should have looked harder first. I did find this buried elsewhere: smtp unix - - y - - smtp Does the 'y' matter rather than the 'n'?
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