For the last few months, I've been getting a lot of random spam into my .mac account. It has been on various topics: Nigerian scams, prescriptions, etc. When I look at the recipient field, the message is only being sent to @mac.com addresses with usernames starting with the letter "a." I try to limit when I use my mobileme account online, so it seems as if people are now able to somehow get a hold of a list of usernames. It certainly is not coming in huge amounts, but getting one or two every week is enough to become annoying. Is anyone else experiencing similar problems?