I just received this at my .Mac account:
Dear user [MY USER NAME],
You have successfully updated the password of your Mac account.
If you did not authorize this change or if you need assistance with your account, please contact Mac customer service at: firstname.lastname@example.org
Thank you for using Mac! The Mac Support Team
+++ Attachment: No Virus (Clean) +++ Mac Antivirus - www.mac.com
Heh. Mac Antivirus? Anybody else received these?
UPDATE: By the way, if you receive something like this and you aren't sure if it is a fake, assuming you are using Mail.app, go to View—>Message—>Raw Source. Grab a couple of the IP addresses in the header and run a Whois on them, or simply scan for them in Google. Most likely, it'll show up as not being Apple, and as being a known spammer. Train your spam filter to recognize it as spam and delete.