right. that's very frustrating. just a few days ago i had to create another email alias because of it.

+ was always a legal character, right from the first SMTP RFC 822

My email for one of my CC accounts is like ...+banksucks@gmail.com because it allows plus-addressing, but doesn't like my domain.

In other words, don't worry, they'll find a way to block your email one way or another. :P