mime type checking seems not to be working

Possible the filetype don#t match? Which file do you send?(.doc = application/msword)

https://www.htmlstrip.com/mime-file-type-checker

https://docs.w3cub.com/http/basics_of_http/mime_types/complete_list_of_mime_types.html

How do you embed/attach the file within mail?

The document was a Word document with the .docm extensiion. It contains a macro that is capable of executing commands once activated.

... and you didn't select something within SMTP policy / File Protection / MIME white list

no, no whitelisting

No Zero Day protection? 

I made a screenshot, does this answer your question:

What should i use?

Hi,

could you fix it?

I have similar issue with other extensions.

Nope, it stil doesn't seem to function correctly.

SFOS and UTM uses true file type detection by SAVI. Which means, the file will be analysed on multiple levels. 

You should create a feedback loop on the top, if you have a example file, which is not detected as you expect it should. 

LuCar Toni could you explain what you mean with the feedback loop and how to configure it, please?