Email from unauthorized sender to unauthorized address
I have Comcast as an email provider. My address looks like [mytag]@comcast.net. Lately I'm getting junk email that looks similar to my address, but ends with "...comcast@[something else each day].xyz". This is not on my approved list of email accounts. I can't delete it. My filter rules aren't working well. How is it hitting my iMail box? How do I peel this away permanently?
MacBook Pro 13″, macOS 10.15