The Quarantine+ feature allows you to view messages that have not been delivered to your mail server yet. This can be helpful if your mail server is offline, unreachable, or experiencing problems.
From within the control panel, go to Quarantine+ > Clean mail and select Queued for delivery from the drop-down list box (top right corner), or use this shortcut: View queued messages
Example delivery log:
If you need help understanding the delivery error message, reach out to our support team for assistance.
Aug 16 14:32:57 bolt108b postfix/smtp: 4RQxZw0NQPz4jbN7: to=<email@example.com>, relay=exchange.xyzemporium.com[184.108.40.206]:25, delay=4.7, delays=3.5/0/0.63/0.54, dsn=4.3.1, status=deferred (host exchange.xyzemporium.com[220.127.116.11] said: 452 4.3.1 Insufficient system resources (UsedDiskSpace[C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\data\Queue]) (in reply to end of DATA command))
After resolving the issue that is causing mail to defer, our mail server will eventually deliver all messages queued for delivery. Or, you can re-attempt a delivery of all messages queued for delivery within 15 minutes by going to the Tools > Flush mail queue option example