Enforce TLS for all none encrypted emails

%3CLINGO-SUB%20id%3D%22lingo-sub-2675232%22%20slang%3D%22en-US%22%3EEnforce%20TLS%20for%20all%20none%20encrypted%20emails%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2675232%22%20slang%3D%22en-US%22%3E%3CP%3E%3CSPAN%3EWe%20have%20created%20a%20transport%20rule%20that%20enforces%20TLS%20however%20we%20would%20like%20an%20exception%20for%20encrypted%20messages%2C%20so%20that%20this%20enforce%20TLS%20is%20not%20applied%20on%20already%20encrypted%20emails.%20but%20I%20am%20not%20able%20to%20find%20how%20to%20set%20this%20exception.%20%3C%2FSPAN%3E%3C%2FP%3E%3CP%3E%3CSPAN%3EWe%20have%20tried%20with%20these%20exceptions%3A%20Message%20type%20encrypted%20Message%20type%20permission%20controlled%20'Content-Class'%20header%20contains%20''XXXX''%20Attachment%20file%20name%20'XXXXX'%3C%2FSPAN%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%3CSPAN%3EAny%20clue%20how%20I%20can%20make%20it%20possible%20to%20enforce%20TLS%20for%20all%20none%20encrypted%20messages%3F%20%3C%2FSPAN%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2675232%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EOffice%20365%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ESecurity%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-2675940%22%20slang%3D%22en-US%22%3ERe%3A%20Enforce%20TLS%20for%20all%20none%20encrypted%20emails%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2675940%22%20slang%3D%22en-US%22%3EUse%20the%20msip_labels%20header%2C%20as%20detailed%20for%20example%20here%3A%20%3CA%20href%3D%22https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fazure%2Finformation-protection%2Fconfigure-exo-rules%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%22%3Ehttps%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fazure%2Finformation-protection%2Fconfigure-exo-rules%3C%2FA%3E%3C%2FLINGO-BODY%3E
New Contributor

We have created a transport rule that enforces TLS however we would like an exception for encrypted messages, so that this enforce TLS is not applied on already encrypted emails. but I am not able to find how to set this exception.

We have tried with these exceptions: Message type encrypted Message type permission controlled 'Content-Class' header contains ''XXXX'' Attachment file name 'XXXXX'

 

Any clue how I can make it possible to enforce TLS for all none encrypted messages?

 

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