Applies to:
- mailRelay
When attempting to send email it is returned with a '550 5.7.1 Message rejected due to content restrictions' message.
Information
This particular error message is typically returned by Exchange based mail servers. The administrator of the recipient system has configured the server such that the email you are sending contains 'suspicious' content. It will be necessary for you to liaise with the recipient to understand what specifically has triggered the filter.