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5.3.5

Message Not Delivered: incorrect configuration of system

The message could not be delivered because the recipient's email provider cannot accept the message. Typically this is caused by a configuration problem creating a mail loop that will no longer handle the message.

Fixes

Contact the sender's email system support team or administrator as the receiving server is not configured correctly. This is something that is typically fixed at the administration level.

Also, consider contacting the recipient through an alternative email address or other means.

5.3.5: Official Definition

5.X.X

[RFC3463] (Standards Track) from the The Internet Engineering Task Force (IETF) definition for codes that start with 5.X.X:

A permanent failure is one which is not likely to be resolved by resending the message in the current form. Some change to the message or the destination must be made for successful delivery.

X.3.X

[RFC3463] (Standards Track) from the The Internet Engineering Task Force (IETF) definition for codes that end with X.3.X:

The system is not configured in a manner that will permit it to accept this message.