Block certain roles

I'm reopening this issue because it isn't fixed in the module's official released code.

If you want the requested feature, you could manually patch as Flying Drupalist suggests.

Or else, we'd need to provide a permission, such as "Bypass block anonymous links" which gets enabled be default for the "authenticated user" role... implement hook_permission, make an install file, implement it within the spam checking function - this is about it I think.

It would give you all the (role based configuration) flexibility needed.

The Spam module has such a permission, called 'bypass filters'.
You can use that module if you want this feature.

Ps: use a version more recent than December 26th, 2010.