Well Gosh, * 2.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in * digit (mb2365[at]gmail.com)
I swear when I recently helped a loved one apply for a Gmail account, Gmail offered names like "vippenheimer321", "snordsberd123", nipplovitz246", as the non suffixed versions are usually all taken up already. So you are penalizing users for doing what Gmail told them to. And as Gmail will "do no evil", therefore the evil is being done by guess who... Anyway, It's score FREEMAIL_ENVFROM_END_DIGIT 0.1 for me from now on.