What criteria should you follow to choose the right spam filtering program? What capabilities must an anti-spam tool have to filter and cut off spam mail in most effective way?

Here are the main features a good anti-spam software must have to block spam effectively:

1) it should be a standalone spam filtering tool, which checks all incoming emails on the server, detects and deletes spam messages.

2) deletion of spam without receiving it in your inbox. This way you won't download all the superfluous kilobytes into your inbox and you won't see annoying spam mail.

3) powerful antispam filters built in one program that analyze the message from "outside" and "inside": message header, message body, and message source. Flexible whitelist and blacklist easy to edit and update are also very useful as they help save much time when filtering emails. Good anti-spam software must also have the Bayesian filter in its arsenal of spam filtering tools.

4) easy and safe method to preview emails marked as spam. Inherent in antispam technology is the fact that there will be false positives and false negatives, i.e., email can be flagged as spam even though it is not actually spam and vice versa.

5) flexible spam filtering. Spam emails should be moved to a separate folder. A good spam filtering software should provide the ability to recover an email if it was accidentally marked as spam and trashed.

Simply put, an anti-spam program must be a standalone, easy-to-use software supplied with powerful anti-spam filters able to be adjusted by every user for his personal needs. Now with all that said above you can choose the right anti-spam software among all spam filtering programs available on the Internet.