451 4.4.0 detected undelivered mail

V

vusald

New Member
Apr 16, 2023
18
1
3
I have some mails in Queue, with error 451 4.4.0
As far as I know, it looks like a DNS issue, bue I did a check, and didn't see any DNS related issues.

What can cause this error else?

Code: 
Sep 20 00:46:13 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 00:46:19 mail postfix/lmtp[13248]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=46781, delays=46775/0.02/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 00:46:19 mail postfix/lmtp[13248]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=46781, delays=46775/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 00:46:19 mail postfix/lmtp[13248]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=46781, delays=46775/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 00:46:19 mail postfix/lmtp[13248]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=46781, delays=46775/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 01:56:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 01:56:21 mail postfix/lmtp[13660]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=50983, delays=50976/0.03/0/6.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 01:56:21 mail postfix/lmtp[13660]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=50983, delays=50976/0.03/0/6.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 01:56:21 mail postfix/lmtp[13660]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=50983, delays=50976/0.03/0/6.4, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 01:56:21 mail postfix/lmtp[13660]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=50983, delays=50976/0.03/0/6.4, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 03:06:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 03:06:21 mail postfix/lmtp[14120]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=55183, delays=55176/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 03:06:21 mail postfix/lmtp[14120]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=55183, delays=55176/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 03:06:21 mail postfix/lmtp[14120]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=55183, delays=55176/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 03:06:21 mail postfix/lmtp[14120]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=55183, delays=55176/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 04:16:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 04:16:21 mail postfix/lmtp[14568]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=59383, delays=59376/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 04:16:21 mail postfix/lmtp[14568]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=59383, delays=59376/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 04:16:21 mail postfix/lmtp[14568]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=59383, delays=59376/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 04:16:21 mail postfix/lmtp[14568]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=59383, delays=59376/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 05:26:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 05:26:21 mail postfix/lmtp[15073]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=63583, delays=63577/0.03/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 05:26:21 mail postfix/lmtp[15073]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=63583, delays=63577/0.03/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 05:26:21 mail postfix/lmtp[15073]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=63583, delays=63577/0.03/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 05:26:21 mail postfix/lmtp[15073]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=63583, delays=63577/0.03/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 06:36:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 06:36:21 mail postfix/lmtp[15567]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=67783, delays=67777/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 06:36:21 mail postfix/lmtp[15567]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=67783, delays=67777/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 06:36:21 mail postfix/lmtp[15567]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=67783, delays=67777/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 06:36:21 mail postfix/lmtp[15567]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=67783, delays=67777/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 07:46:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 07:46:21 mail postfix/lmtp[16008]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=71983, delays=71977/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 07:46:21 mail postfix/lmtp[16008]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=71983, delays=71977/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 07:46:21 mail postfix/lmtp[16008]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=71983, delays=71977/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 07:46:21 mail postfix/lmtp[16008]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=71983, delays=71977/0.02/0/6.2, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 08:56:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 08:56:21 mail postfix/lmtp[16478]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=76183, delays=76177/0/0/6.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 08:56:21 mail postfix/lmtp[16478]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=76183, delays=76177/0/0/6.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 08:56:21 mail postfix/lmtp[16478]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=76183, delays=76177/0/0/6.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 08:56:21 mail postfix/lmtp[16478]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=76183, delays=76177/0/0/6.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 10:06:15 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 10:06:21 mail postfix/lmtp[17161]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=80383, delays=80377/0/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 10:06:21 mail postfix/lmtp[17161]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=80383, delays=80377/0/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 10:06:21 mail postfix/lmtp[17161]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=80383, delays=80377/0/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 10:06:21 mail postfix/lmtp[17161]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=80383, delays=80377/0/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 11:13:51 mail postfix/qmgr[1831]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 11:13:57 mail postfix/lmtp[17854]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=84439, delays=84433/0.02/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 11:13:57 mail postfix/lmtp[17854]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=84439, delays=84433/0.02/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 11:13:57 mail postfix/lmtp[17854]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=84439, delays=84433/0.02/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 11:13:57 mail postfix/lmtp[17854]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=84439, delays=84433/0.02/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
Sep 20 11:39:39 mail postfix/qmgr[18302]: B92002A12E1: from=<sender@sender.tld>, size=163425, nrcpt=4 (queue active)
Sep 20 11:39:46 mail postfix/lmtp[18316]: B92002A12E1: to=<recipient3@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=85987, delays=85981/0.04/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient3@recipient.tld> (in reply to end of DATA command))
Sep 20 11:39:46 mail postfix/lmtp[18316]: B92002A12E1: to=<recipient2@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=85987, delays=85981/0.04/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient2@recipient.tld> (in reply to end of DATA command))
Sep 20 11:39:46 mail postfix/lmtp[18316]: B92002A12E1: to=<recipient4@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=85987, delays=85981/0.04/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient4@recipient.tld> (in reply to end of DATA command))
Sep 20 11:39:46 mail postfix/lmtp[18316]: B92002A12E1: to=<recipient@recipient.tld>, relay=127.0.0.1[127.0.0.1]:10023, delay=85987, delays=85981/0.04/0/6.1, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient@recipient.tld> (in reply to end of DATA command))
 
Last edited:
Please post all logs from that time-frame - without the information from pmg-smtp-filter (and all others) this cannot be answered.
 
What's the output of `pmgversion -v`?

I fetched the logs - feel free to delete them (since they contain sensitive data)
 
Stoiko Ivanov said:
What's the output of `pmgversion -v`?

I fetched the logs - feel free to delete them (since they contain sensitive data)
Click to expand...

Code: 
proxmox-mailgateway: 7.1-1
pmg-api: 7.1-1
pmg-gui: 3.1-1
pve-kernel-5.13: 7.1-4
pve-kernel-helper: 7.1-4
pve-kernel-5.13.19-1-pve: 5.13.19-3
clamav-daemon: 0.103.8+dfsg-0+deb11u1
ifupdown2: 3.1.0-1+pmx3
libarchive-perl: 3.4.0-1
libjs-extjs: 7.0.0-1
libjs-framework7: 4.4.7-1
libproxmox-acme-perl: 1.4.0
libproxmox-acme-plugins: 1.4.0
libpve-apiclient-perl: 3.2-1
libpve-common-perl: 7.0-14
libpve-http-server-perl: 4.0-4
libxdgmime-perl: 1.0-1
lvm2: 2.03.11-2.1
pmg-docs: 7.1-1
pmg-i18n: 2.6-2
pmg-log-tracker: 2.2.0-1
postgresql-13: 13.11-0+deb11u1
proxmox-mini-journalreader: 1.3-1
proxmox-spamassassin: 3.4.6-4
proxmox-widget-toolkit: 3.4-4
pve-firmware: 3.3-3
pve-xtermjs: 4.12.0-1
zfsutils-linux: 2.1.1-pve3
 
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