SSL Signature Check (SSLSigcheck) is an email filter designed to be run from within procmail. It will examine the signature and certificate of a signed email, and add header information that procmail recipes can use to filter the message.
A procmail based antivirus filter for incoming mail servers on Unix. It is efficient and tiny. Supports UUE, Zip and Rar attachments, Base64 and Quoted-Printable encodings. Identifies viruses, PUAs and phishings using the ClamAV clamscan virus scanner