In blocking spam, there is always a struggle between blocking as much spam as you can and inadvertently blocking things which are not spam (otherwise known as "false positives").

Luckily, Lookup whitelists allow you to cast a wide net for spammers while also dealing with persistent false positives which might otherwise keep you from using effective tests.

How to use

If you find that, in addition to a lot of spam, legitimate feedback items are being caught by one or more of the SpamLookup tests, you can add either the sending server's IP address (or even a partial IP address to allow an entire IP block) or the domain that would be included as the TrackBack URL.

This is especially effective if you've turned on advanced TrackBack lookups but have one visitor who often sends TrackBack pings from their blogging client.

Simply place each full or partial domain or IP address on a line by itself. If a comment or TrackBack is submitted by an IP address that matches or contains a specified domain, SpamLookup will not contribute to its junk rating.