Clam AntiVirus is a GPL anti-virus toolkit for UNIX and was coded to detect email viruses.  It has a very flexible scanning engine which can be used to provide Third-Party add-on signatures.

Sanesecurity add-on signatures provide enhanced email security against the following email types:

Phishing, Spear phishing, Fake lottery, Ecard malware, Casino, Fake jobs, Fake loans, 419s, Fake Diplomas, porn, emailed malware and other general spam.

Since 2006, SaneSecurity have provided ClamAV Third-Party signatures to the web community that are of professional quality.

Signatures are updated serveral times a day and our twitter page reflects that.

We are not a company… and producing the signatures and support for the signatures, are carried out in our spare time.