How does Pinjo work?

How does Pinjo work?

Pinjo is a Windows-based SMTP client/server service which is installed between the internet and your SMTP server.

It protects you of all those unsolicited emailmessages, using spam-blacklistservers and several other features. It analyses every incoming mailmessage for being spam. You can either install it on a dedicated server or combine it with any windows-based mail server.