I guess, if you *really* wanted to block mp3's being emailed you could create a type4 ndb signature to match the mp3 base64 in the email ?
eg... email format... ========================== Content-Type: audio/mpeg; name="test.mp3" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="test.mp3" SUQzAwAAAA ========================== .. but depends on what you are trying to do... Cheers, Steve Sanesecurity _______________________________________________ Help us build a comprehensive ClamAV guide: https://github.com/vrtadmin/clamav-faq http://www.clamav.net/support/ml