ClamSMTP: An SMTP Virus Filter

ClamSMTP is an SMTP filter that allows you to check for viruses using the software. It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. The 'DATA' email body is intercepted and scanned before forwarding.

ClamSMTP aims to be lightweight, reliable, and simple rather than have a myriad of options. It's written in C without major dependencies. If you need more options then you could use something big like which is written in PERL and can do almost anything.

I wrote this with the mail server in mind. how to configure it as a Postfix Content Filter.

ClamSMTP can also be used as a to filter an entire network's SMTP traffic at the router.