I just received this email and immediately called Comcast to report it. They have a team tracking it down.
They said they will never send you anything regarding your account via email.
----- Forwarded Message -----
From: "Comcast Billing" <billing@comcast.net>
Sent: Friday, April 15, 2011 8:31:01 AM
Subject: [URGENT] Billing Problem
Comcast Ecobill
Dear Comcast Customer,
We were unable to process your last payment because some of your information was incorrect. Did you recently change your credit card, bank, address or your phone?
Sign in now to update your billing information and avoid service interruption.
Sincerely,
Comcast Cable
www.comcast.com
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