Symptoms
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Emails are not delivered to a mailbox that is located on the Plesk server ([email protected] for the purpose of this example)
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Errors that are similar to the following are logged in the
/var/log/maillog# [root@server ~]# cat /var/log/maillog | grep "Mailbox full"
...
Jul 30 09:08:45 panel psa-pc-remote[919458]: 7349816000E5: check-quota: stderr: DATA REPLY:452:4.2.2 Mailbox full
Jul 30 09:08:45 panel postfix/cleanup[3551410]: 7349816000E5: milter-reject: END-OF-MESSAGE from mail-qk1-f197.google.com[209.85.222.197]: 4.2.2 Mailbox full; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail-qk1-f197.google.com> - Notifications that are configured to be sent from your Plesk server are returned to the mailbox of the main Plesk administrator as a non-delivery notification that has contents which are similar to the following:
<[email protected]>: host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in
processing, id=3361739-19, delivery-notification FAILED: Assert failed: ,
0, , 0 at /usr/share/perl5/vendor_perl/Amavis/Notify.pm line 706. (in reply
to end of DATA command)
Reporting-MTA: dns; panel.example.com
X-Postfix-Queue-ID: 5C8E6160422B
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Thu, 25 Jul 2024 04:46:19 -0500 (CDT)
Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 4.5.0
Remote-MTA: dns; 127.0.0.1
Diagnostic-Code: smtp; 451 4.5.0 Error in processing, id=3361739-19,
delivery-notification FAILED: Assert failed: , 0, , 0 at
/usr/share/perl5/vendor_perl/Amavis/Notify.pm line 706. - Errors related to the outgoing notification email that are similar to the following are present in
/var/log/maillog:# [root@server ~]# cat /var/log/maillog | grep 5C8E6160422B
Jul 30 03:49:47 panel postfix/qmgr[1084515]: 5C8E6160422B: from=<[email protected]>, size=11903, nrcpt=1 (queue active)
Jul 30 03:49:48 panel postfix/cleanup[3457731]: 530C71600CD4: message-id=<[email protected]>
Jul 30 03:49:48 panel postfix/smtp[3457719]: 5C8E6160422B: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=428609, delays=428608/0.02/0.02/0.82, dsn=4.5.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in processing, id=3377957-12, delivery-notification FAILED: Assert failed: , 0, , 0 at /usr/share/perl5/vendor_perl/Amavis/Notify.pm line 706. (in reply to end of DATA command))
Jul 30 04:59:47 panel postfix/qmgr[1084515]: 5C8E6160422B: from=<[email protected]>, size=11903, nrcpt=1 (queue active)
Jul 30 04:59:48 panel postfix/cleanup[3475031]: F0EEC160013D: message-id=<[email protected]>
Jul 30 04:59:48 panel postfix/smtp[3475021]: 5C8E6160422B: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=432809, delays=432808/0.02/0.02/1.1, dsn=4.5.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in processing, id=3361739-19, delivery-notification FAILED: Assert failed: , 0, , 0 at /usr/share/perl5/vendor_perl/Amavis/Notify.pm line 706. (in reply to end of DATA command))
Jul 30 04:59:48 panel postfix/qmgr[1084515]: 5C8E6160422B: from=<[email protected]>, status=expired, returned to sender
Jul 30 04:59:48 panel postfix/bounce[3475060]: 5C8E6160422B: sender non-delivery notification: 687031600968
Jul 30 04:59:48 panel postfix/qmgr[1084515]: 5C8E6160422B: removed
Cause
The recipient mailbox on the Plesk server has reached its size limit, due to which it cannot receive more emails.
Resolution
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Go to Domains > example.com > Email Addresses > [email protected]
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Increase the value in Another size field:
Note: It is also recommended to delete any old and unusable emails from the mailbox that is affected in order to free up space for new emails.
This…