ivs-milter (http://freshmeat.net/projects/ivsmilter/) has had this feature since design date.
On Mon, Mar 08, 2004 at 11:03:55AM -0500, Brett Simpson wrote: > >>> [EMAIL PROTECTED] 3/4/2004 5:35:34 PM >>> > > Nope, that won't work. Besides blocking purely based on name we also run > > 'file' on the attachments and block based on the type of file returned by > > 'file'. So, a windows executable renamed from foo.exe to foo.txt will > > still be caught as a banned 'exe' file - blocking only based on the name > > would be way too primitive. > > How did you impliment this? I like the idea of checking the file to see if the > extension matches what is returned by the file command. > > Brett > >
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