Lets not post email address just in case they belong to someone innocent.
The thing about spammers and hackers is they know better then to use any real email that can be traced back to them. 99.9% of spam has the email address (return address) spoofed, faked and automated as they send out their spam.
They have huge email lists to send spam to and part of that trick is to take emails in that list and put it into the return address. They know the email will get blocked within a day and so they constantly change it.
I have had multiple customers who would get thousands of undeliverables email messages flood their inbox and they had no clue why. It was because a spammer was using their email address in the return address, so all the failed emails got sent ot them. After a day or so they would stop as the spammer started using another return address.
When ever you get an email and you are not sure if it is from the person in question always look at the header of the email, it will show the email server it came from. Most of the time you will see it didnt come from the proper server, such as a yahoo address that didnt get sent from the yahoo servers. In this case this user as well would have to have their emails sent through comcasts email servers, so check the header and see if the email is coming from there.
If it is then it is also possible the person account is hacked and being used. But again, no smart hacker, spammer or what ever will ever use an account directly tied to them. It is like robbing a store with your picture ID attached to your shirt.
Shane