possible email scam?

It most likely is a scam.  Comcast doesn't send messsages like that.  To see if an email is legit, see here------------------

https://customer.xfinity.com/help-and-support/internet/comcast-verified-email/

To  report a phishing scam see here and scroll down to" Report Phishing Emails"---------

https://constantguard.xfinity.com/help/report-abuse/

In the meantime run a complete scan of yor system with your A/V software to see if it finds anything.

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@Will-7 wrote:

Thanks, I copied to Spam folder, and sent the email to abuse@comcast.net,  can't wait to see what damage was done.  *** who punishes these bad guys? ***

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Unfortunately, scammers are extremely difficult to track down.  They change email accounts and addresses constantly.  You should find this of interest on the subject----------

https://us.norton.com/internetsecurity-emerging-threats-how-do-cybercriminals-get-caught.html

Here is more feed-back - This morning, 1 day after the Hack, we started getting calls from our Contact List, and all of them were being asked to HELP.  Yes, they are now being Hacked.  Next, I saw our Address Book is now Empty, and worst yet - our backup sets all have Empty Address Books.  Yes, we had Backup set to Automatic.  If we had changed Backup to Manual quickly enough, that would have allowed a Restore.  So this Note is to  - Warn others of Good precautions.  Also, I had a copy of most of my email addresses in a document, so that will allow Rebuilding most of my Address Book.  I will probably need to Change my Email address, and who knows what else.  *** I Hate It, and don't want others to go thru this ***