I'd like to write a custom rule that would allow e-mail in from users that have an attachment
with a weird in house extension like foo.bar . How would I do this?
How about delivering it before spamassassin sees it in procmail?:
:0 * ^Content-Transfer-Encoding:.*base64 * ^Content-(Type|Disposition):.*$?.*name.*=.*\.(bar|xxx|yyy|zzz) $DEFAULT
