Message Audit Log Details shows that delivery has failed. The delivery details show a message in the format:
### #.#.# Response message
550 5.7.1 message rejected due to content restrictions
The Delivery Details show a response from the next SMTP hop when trying to delivery the message. If the details do not show [internal], then the error message is originating from a different Mail Transfer Agent (MTA), usually either an internal server for inbound or an external server for outbound.
You will need to review the SMTP transactions and/or diagnostic log files from the receiving MTA referenced in the "Attempted Delivery to:" of the Message Audit Log.
This message is a delivery response from another MTA that Messaging Gateway is reporting, not a message that is being generated by the Messaging Gateway itself.
Imported Document ID: TECH165702
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