That's weird. I don't have any messages in my sent box going to Webmaster at all. And my inbox only has posting replies that have been sent to me.
I don't know what the system is really picking up at this point to be blocking people. It looks inconsistent.
I haven't tried logging in as a new user and new email but thought to try that soon just to communicate, because I don't want to have to keep bugging people this much to talk to the Webmaster for me. I'm not sure if that will work though as I don't know if it's picking up on the IP address or what.