There was some networking work performed that broke my outbound email flow due to an unexpected IP address change. Email queued up during the equipment install as expected with dsn=4.7.5 or dsn=4.0.0 codes. Two days later one of our external vendors returned a dsn=5.7.1 which caused Postfix to remove the email from the queue since this is not a temporary error. From my reading of the documentation everything is working as designed. Am I overlooking a setting or options to modify this behavior so email will stay queued even when we receive a permanent error so that we do not lose mail again if something similar happens?
Config: # postconf maximal_queue_lifetime maximal_queue_lifetime = 5d Select Log Entries/Comments Sep 18 12:22 Email arrives from internal server and queued on internet facing server that routes through gateway which is not available due to network shenigans. Sep 18 12:22:38 mta postfix/error[1641421]: 63AD7200269B: to=<xxx-redacted-...@xxx-redacted-xxx.com>, relay=none, delay=0.06, delays=0.05/0/0/0, dsn=4.7.5, status=deferred (delivery temporarily suspended: Cannot start TLS: handshake failure) Sep 18 Same message repeats all day Sep 19 Same message repeats all day Sep 19 Same message repeats until 10AM Sep 20 10:00:01 mta postfix/error[1861496]: 63AD7200269B: to=<xxx-redac...@xxx-redacted-xxx.com>, relay=none, delay=164243, delays=164243/0.05/0/0.02, dsn=4.0.0, status=deferred (delivery temporarily suspended: host xxx-redacted-xxx.com[111.222.333.444] refused to talk to me: 421 xxx-redacted-xxx.com closing connection) Sep 20 Same message repeats until 11:10AM Sep 20 11:10:04 mta postfix/smtp[1867039]: 63AD7200269B: to=<xxx-redac...@xxx-redacted.com>, relay=xxx-redacted[111.222.333.444]:25, delay=168446, delays=168444/2/0.65/0.05, dsn=5.7.1, status=bounced (host xxx-redacted.com[111.222.333.444] said: 550 5.7.1 Relaying denied (in reply to RCPT TO command)) Sep 20 11:10:05 mta postfix/qmgr[1811745]: 63AD7200269B: removed
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