Plesk - message cannot be delivered at this time
A plesk server running postfix shows mail queue entries like these:
[root@server ~]# mailq 50ACA7BA23B2 2646 Wed Jul 29 23:58:42 MAILER-DAEMON (Message can not be delivered at this time) email@example.com
or the respective log messages in /var/log/maillog:
Jul 30 13:13:44 srv1 postfix/pipe: D24A17BA0BD4: to=<firstname.lastname@example.org>, relay=plesk_virtual, delay=71918, delays=71914/0/0/3.9, dsn=4.2.1, status=deferred (Message can not be delivered at this time )
Log into your Plesk webinterface and check if a password has been set for this email account. If it's missing generate a new one or disable the mailbox.
This bug is known as PPPM-8076 and should be resolved with a future Plesk update.>