When you receive a comment or a TrackBack from someone and publish it, there is a very strong likelihood that future contributions from that person are also not spam. SpamLookup can be directed to contribute a positive (non-spam) score to:

• Comments with an previously seen email address
• Comments with an previously seen URL (in the URL field, not in the comment body)
• TrackBacks with a previously seen source URL

This credit only takes place if the rest of the item is devoid of other URLs, which protects you in many cases from a spammer trying to submit one good comment and they follow-up with a lot of spam comments.

Recommended settings

We recommend that both tests be enabled and their scores set to 1.