You can easily add any mime-type to the $banned_filename_re or
$banned_namepath_re lists.
But keep in mind the mime-type is declared by the sending mail
client and can be set wrong, either by buggy software or an
attacker. Amavis does not "normalize" the mime-type.
As a general rule, using the file extension as determined by file(1)
and @map_full_type_to_short_type_re is more reliable for blocking
specific file types since it doesn't depend on information provided
by the client.
-- Noel Jones
I guess I was mistaken that using the mime-type was more reliable than
using a file extension since the file extension can be easily modified
also? So, if I were to ban .rar files, and someone send me a rar file
called "archive.rar" but they renamed it to "archive" it will still be
blocked by Amavis?
