One of my good friends, he's a developer and wanted me to ask this question on the forum. He currently sends a DLL or EXE file to one of his customers (who's a part of a big company). This is his process:
Rename the executable file (module.dll -> module.d__)
zip the file with password so that it cannot be unzipped by the mail server
rename the zip file (module.7z -> module.7.txt)
send this via email and add a lengthy explanation for the guy at the other end on how to get at the file
cross fingers that it'll get through the filters
He understands that the email filter won't bare EXE attachments but here's his question: Are email filters (that are unzipping attachments and additionally checking the unzipped files for executables) adding any more security? Hopefully this makes sense. Thank you.