Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
SpamSieve - Save time by adding powerful spam filtering to the e-mail client on your Mac.
POPFile - POPFile classifies email into categories you define.
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.