Here's a scam going around, and it's not even well done. They do steal logo art from your provider, but it's pretty lame stuff. I guess they are into ID theft or are looking to hijack email accounts or may be into malware.
Pass on to your less than savvy friends...
Dear Customer
Your E-mail account has exceeded its limit and needs to be verified, if not verified within 24hours, we shall suspend your account. Click Here to verify your email account now
Thanks,
AT&T.
Thank You for Being A Loyal Yahoo! Mail User
In the original, mouse over "here" shows a bogus URL.