blocking certain email-domains in notes

I've been seeing a lot of notes comming from php-general@lists.php.net, and such lately. Most of the notes submitted with that are either bogus, support-requests, etc. (basically your day-to-day non-useful documentation notes). Maybe it would be a good idea to block any notes comming from @lists.php.net ? Apart from that, I haven't checked yet, but IMO any notes being submitted from an @php.net email adress should be verified / only allowed if the user is logged in with that username. And a third question, where do all the *@osu1.php.net emails come from? Clearly those are bogus emails; some notes are correct and useful, but still... anyway, your thoughts on this please? - tul