May not have been hate mail it may in fact have been a worm
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_NETSKY.B This virus actually has a whole heap of possible messages amongst those are the message "you are bad" "you try to steal"
Like all worms the sender is not aware of sending them. I myself have received this worm on 3 seperate occasions. All one can do is delete and note that there is another worm with similar charateristics Netsky.C that is spreading rather quickly.
Alex
