An email message may get content filtering violation under the condition "If the message contains Attachment" in Email Contents Filtering Policy even if an email message does not contain any attachments
In SMG 10.7.x, the engine has been changed for enhanced malware effectiveness. With the new engine, an email message that actually does not contain any attachments may result in contents filtering violation if the "Message Contains Attachment" condition is set in Email Contents Filtering Policy.
Release : SMG 10.7.x
Component : Email Contents Filtering Policy, "Message Contains Attachment" condition
We are aware of this behavior of the new engine and will update this document when updated information is available.