Got email saying my Xfinity Mailbox is Out-dated

Got this email today. I suspect its spam/scam but it came from a comcast email address  and spam/scams usually have gmail addresses so I want to make sure its not real. Thanks, Terri

  Below is the entire email and it came from  Xfinity Email < [Edited: "Personal Information"]>. Here is the beginning of the email header info....Received: from oxapp-ch2g-44o.email.comcast.net ([96.118.129.128])
 (using TLSv1.2 with cipher ECDHE-RS

Thank you for choosing XFINITY.

Our record shows that your Xfinity Mailbox is Out-dated which has
caused some incoming mails to be placed on pending. You are required to validate your Mailbox in order to be able to receive new mails. or your access to our services will be terminated.

Failure to validate your email box immediately will lead to
permanent deactivation without warning.

Click the validate updated link for tips on how to keep your XFINITY Voice account secure.