It sounds as if it could be letting you know that there is a dvr message. If it is, it has nothing to do with email. It could be letting you know of an upcoming pay-per-view event or maybe a guide change.
Comcast employees must be authorized to post in the forum in an official capacity. Employees posting here have their names in red and are designated as employees. Names not in red are customers.
This is done to protect customers and for assurance that they are dealing with a Comcast employee. Non-Authorized Employees are allowed to post but cannot state they are employees nor can they allude to being employees.