customizable open proxy scanner for comments

[tandilboy]

a good new feature is customize the open proxy scanner ports, to block certain open ports and filter more spammers

[JeremyVisser]

WordPress already does this. Go to Options > Discussion and tick the "Blacklist comments from open and insecure proxies" box.

[markjaquith]

This feature has been removed in 2.1, so this is now plugin territory. SK2 supports it, but a standalone proxy checker might be of some use.