What are some alternatives?
Spamfence.net - Professional e-mail security free for private use: With Spamfence.
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
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).
Mailwasher - Over 8 million people use MailWasher as their spam filter
BitNinja.io - BitNinja is the first integrated server defense network, can be installed within 1 minute on any...