Server mail rule - attachment file extension

Dear All,I try to create a server mail rule which will reject all mail that contain attachment with extension file is .exe.

So the rule goes like this:

“when any attachment name contains .exe don’t deliver message - send NDR full”

It works beyond the expectation,

mail with attachment named : setup.exe → blocked

mail with attachment named : executive_report.doc → also blocked.

Any suggestion how to prevent the second case happened?

Thanks a lot for any comment.

Regards,

Yusuf Abdella