Obviously quite a few people like this idea, but I see it as another way for spam to reach me. I try to avoid having mail forwarded to me because it bypasses my prefered method of dealing with spam, which is to have the server refuse to accept it (as opposed to filtering later). Also I just don't see the point--if I want mail from someone, I'll give the person my email address (and if I wanted to conceal that, I'd just make a temporary quick account somewhere).

So I'm opposed to just going through everyone's names. Make it optional and I have no problem with it.