bogofilter is described as 'Bogofilter is a mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body). The program is able to learn from the user's classifications and corrections'. There are three alternatives to bogofilter for Online / Web-based, Self-Hosted solutions, SaaS and Linux. The best alternative is SpamAssassin, which is both free and Open Source. Other great apps like bogofilter are EuropeanMX (Paid) and Altospam (Paid).
Use this program to "Unspam" your mailbox(es). The program can be integrated with the mail server to automatically filter all mail for a site. It can also be run by individual users on their own mailbox and integrates with several mail programs.
EuropeanMX blocks incoming spam and virus emails before they are reaching your network. With our outgoing filter you can secure your server's reputation. And last but not least we are offering encrypted cloud storage to archive all your emails.