It is interesting from the viewpoint of the spammer vs. regular guy. The spammer is going to tell you that delivering to yahoo is hard (I know, it sounds ridiculous) and hotmail seems to be very easy until you realize they are just throwing your email into nothing. If hotmail really thinks you are a spammer, they send you a "200 OK" response after you are done sending your message then they delete your message forever. Not to junk, not to inbox, you just don't make it in at all. This is a great way for them to manage spam because writing to
Yes, I may have run a few too many email servers for too long.