My Apple Mail : I receievd a spam email from myself: how do I clean it?

In my Inbox, Comcast, there were 4 emails from someone in which the visible sender was my contact photo and email username, though its "under the hood” ID was external.

Of course I changed my password and sent the offending headers and raw source to Comcast Tech.

Yet the sender did it again last night around 3 am.

How do I clean someone using my username and photo?

Suggestings are most welcome’d!