multiple zip with restricted file type

%3CLINGO-SUB%20id%3D%22lingo-sub-3201256%22%20slang%3D%22en-US%22%3Emultiple%20zip%20with%20restricted%20file%20type%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-3201256%22%20slang%3D%22en-US%22%3E%3CP%3EWe%20currently%20have%20a%20selection%20of%20extensions%20that%20are%20not%20allowed%20to%20be%20sent%20or%20received%20via%20e-mail.%26nbsp%3B%20This%20is%20defined%20in%20the%20anti-malware%20threat%20policy.%26nbsp%3B%20I%20have%20discovered%20that%20if%20one%20of%20the%20blocked%20filetypes%20is%20added%20to%20a%20zip%20inside%20a%20zip%2C%20it%20is%20allowed%20to%20be%20delivered.%26nbsp%3B%20(test.docm%20inside%20test.zip%20inside%20test.zip)%26nbsp%3B%20Should%20this%20not%20be%20rejected%3F%26nbsp%3B%20If%20I%20perform%20a%20single%20zip%20(test.docm%20inside%20test.zip)%2C%20the%20email%20is%20rejected.%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-3201256%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EMicrosoft%20Defender%20for%20Office%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
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We currently have a selection of extensions that are not allowed to be sent or received via e-mail.  This is defined in the anti-malware threat policy.  I have discovered that if one of the blocked filetypes is added to a zip inside a zip, it is allowed to be delivered.  (test.docm inside test.zip inside test.zip)  Should this not be rejected?  If I perform a single zip (test.docm inside test.zip), the email is rejected.

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