The only chain mail I truely hate is the kind that has scare tactics at the end.
'Send this to 25 people or a ghost will come in your room in the middle of the night and rape your dog'.
However, that's not the part that bothers me.
It's when people are stupid enough to believe it, get scared, and repost it.
I also can't stand chain text messages. I've gotten a hand full of them from people, and cussed out every single one of them.
Now, the chain mail I really don't mind at all are the ones that have interesting stories or something in them.
My mom sends me some funny ones once in a while xP
The only chain mail I ever send out would be the funny ones I get from my mom, but I take off the 'send to x amount of people' part.