I noticed something in our mail logs that I thought was unusual. What does it mean when smtpd reports a NOQUEUE without any kind of reject: reason? All that's there is the client.
Aug 5 17:42:58 b1 postfix/smtpd[18503]: NOQUEUE: client=a26-70.smtp-out.us-west-2.amazonses.com[54.240.26.70] Aug 5 17:43:34 b1 postfix/smtpd[18632]: NOQUEUE: client=mail-mw2nam12on2054.outbound.protection.outlook.com[40.107.244.54] Aug 5 17:44:59 b1 postfix/smtpd[18653]: NOQUEUE: client=mail-io1-f54.google.com[209.85.166.54] I don't see any rhyme or reason to the affected clients. There are plenty of big email providers, small ones, etc. I even found an internal connection from another server, which helped me see that the same connection *does* go on to send a message successfully after the NOQUEUE. Here's an example from outlook.com: Aug 5 18:06:59 b1 postfix/smtpd[20637]: connect from mail-mw2nam12olkn2071.outbound.protection.outlook.com[40.92.23.71] Aug 5 18:07:00 b1 postfix/smtpd[20637]: Trusted TLS connection established from mail-mw2nam12olkn2071.outbound.protection.outlook.com[40.92.23.71]: TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits) Aug 5 18:07:00 b1 postfix/smtpd[20637]: NOQUEUE: client=mail-mw2nam12olkn2071.outbound.protection.outlook.com[40.92.23.71] Aug 5 18:07:04 b1 postfix/smtpd[20637]: proxy-accept: END-OF-MESSAGE: 250 2.6.0 from MTA(smtp:[127.0.0.1]:10027): 250 Queued on server; from=<redacted> to=<redacted> proto=ESMTP helo=<NAM12-MW2-obe.outbound.protection.outlook.com> Aug 5 18:07:04 b1 postfix/smtpd[20637]: disconnect from mail-mw2nam12olkn2071.outbound.protection.outlook.com[40.92.23.71] ehlo=2 starttls=1 mail=1 rcpt=1 bdat=1 quit=1 commands=7 There's only one mail, one rcpt, etc shown in the disconnect summary, and one actual message with one recipient did go through, so I just don't understand where the NOQUEUE came from. This appears to happen ~25,000 times a day, so I'd like to better understand what's causing it and if it represents a problem. Or if I've just left a debug setting enabled somewhere. :-) If it matters, this is on Postfix 3.7.2. Thanks for any advice!
