Delivery fails with details showing "550 5.7.1 Message rejected due to content restrictions"
Last Updated June 25, 2018
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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