What are some alternatives?
When comparing Spamihilator and SpamAssassin, you can also consider the following products
Mailwasher - Over 8 million people use MailWasher as their spam filter
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
Spamfence.net - Professional e-mail security free for private use: With Spamfence.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.