WordPress MU

I installed the Farms comment spam pack which has the Simple Spam Filter
plugin. This plugin should n't allow more than 2 links in a comment.

If I enter
http://www.google.com
http://www.yahoo.com
http://www.msn.com

It accepts it. When the comment published, its shown as

http://www.google.com
http://www.yahoo.com
http://www.msn.com

This plug in is checking for http:// in the url before its
passed to the comment processing. If the plugin gets the comment
text after its processed (converting the links to http://), then
it would be more effective.

Is there any action like post_comment to check the comment text?
I didn't find one in code.

WPMU by default already forces moderation on comments with more than 2 links. The plugin you're trying is pretty outdated, should try something like wordpress hashcash.

I find Simple Spam filter still works pretty well. You may have to edit it directly to tweak it though.