Unfortunately today, we all receive endless unsolicited and unwanted mail, which has now become known commonly as "junk mail", or "spam".

Sadly, as much as 60-70% of mail received by businesses today are in reality these "spam" messages, as shown by the comment below from a BusinessMail customer who subscribes to our lists.

 I've just GOT to write to say thanks for all your efforts with the anti-spam system. I kept deleting the log file so I can't be precise but you have certainly spared us several thousand spam messages since the previous update. And I haven't been aware of any false-positives. BRILLIANT! I'll keep the log file this time round.

How on earth you can endure reading the wretched things I just cannot imagine. However, it really DOES the job amazingly well, and all without all the "whizzo" algorithms of the 'sophisticated' systems, so please please please keep up the good work, however horrible !!!!!
Roger Osborne-King - TRIANGLE JOURNALS LTD UK.

The BusinessMail mail server provides three separate anti-spam systems with various options to help you control this daily menace, plus matching "white lists" to allow you to overrule a "positive match" for individual messages.

The first and most powerful is the "known spam domains" system, which blocks all mail from any sender that uses a domain in your domains black list. Assuming you have subscribed to our own anti spam lists, or you have created your own appropriate domains black list, this filter alone will typically block around 70-80% of all spam mail received.

The second  is a subject line or message body matching system, and the BusinessMail mail server checks the entire message for any matching word(s) or phrases.  In fact BusinessMail even removes all carriage returns etc so that it can identify matches that may wrap over more than line, and it even decodes BASE64  content so that it can identify matches in encoded messages.

The third is a senders address matching system, which checks both the From and the Reply-to addresses in all messages, and matches these against your list of known spam senders.

The BusinessMail mail server is also able to identify the latest "trick" used by these spammers in HTML messages, where they add endless "comment markup" in the messages to break words up .  BusinessMail will identify this as spam if there are more than xx occurrences of these "comments".  (You can set the number)

All these anti spam measures use standard ASCII text lists that you maintain, which provides you with total control over what is treated as spam.