Email Message Delivery Failure: Message has been requeued.

Refers to:

  • Plesk 11.5 for Windows
  • Plesk 12.5 for Windows

Created:

2016-11-16 12:57:53 UTC

Modified:

2016-12-21 19:38:50 UTC

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Email Message Delivery Failure: Message has been requeued.

Symptoms

Message could not be delivered with the following error in SMTP log:

Message Delivery Failure. Attempt (3): Domain () returned temporary error for email. Message has been requeued.

The following errors can also be found in the SMTP log:

Remote server returned a response indicating a permanent error. Server Response: (550 5.7.1 Your mail from xxx.xxx.xxx.xxx was rejected due to being listed by Cloudmark.  For details, please see http://csi.cloudmark.com/reset-request/)

or if a message is sent to aol.com:

421 4.2.1 :  (DYN:T1)  http://postmaster.info.aol.com/errors/421dynt1.html

Cause

Server IP address is blacklisted on remote SMTP server side.

Resolution

Check sender mail server IP address for being blacklisted at http://mxtoolbox.com/ and consider contacting one of the organizations mentioned in the error messages to delist the IP address.

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