On Mon, 29 Oct 2018 12:33:19 -0400, Kris Deugau stated:

Tilman Schmidt wrote:

Am 26.10.18 um 15:34 schrieb Johnny Time:  

For exemple, we wanted to authorize only a white list which contains
*.doc,*.xls,*.pdf and ban the others extensions.  

Surely you meant to write "*.docx,*.xlsx,*.pdf"?
*.doc and *.xls are the old, malware-prone MS-Office filetypes.
You don't want to let those pass, at least not without rigorous
examination.  

In my experience, the new ones aren't any better.

We have a a steady flow of "*.doc", "*.docx" "*.xlsx" and *.pdf" files
exchanged with other offices. I have not seen a virus in any of them since
2010. Seems like you might be doing business with the wrong type of people.