What is a SPAM score?

The SPAM score is the rating given to any email message that has passed through a SPAM filter.

The SPAM score evaluates the probability of whether the message in question is unsolicited or not. It is initially “0” and decreases if the message has features that do not indicate SPAM or increases if features are found that are often present in SPAM messages. The score can be negative (with sign ‘-’) or positive (without sign).

An e-mail message is treated differently by the mail server depending on the SPAM score (e.g. moved to the SPAM folder) or even rejected. The user can also set his own actions based on the SPAM score.

See also:
Mailix Documentation: What is the SPAM score?
Wikipedia: SPAM Filter