It happens to me also and drive me nuts. I tried going to ad blocker in the general settings but it did no good. Also, when I try to "unsubscribe" to unwanted ads, I get a notice back that says "not a good e-mail address" or something of the sort. I must have 30 of them now in my inbox. I'm saving them until I find out who to complain to. I think something I subscribed to is letting other companies in on my e-mail and they don't want me to be able to "unsubscribe".