Here's how to keep this out of your mailbox. In June, I began tracking the junk mail I was receiving. A plea to embark on Princess Cruises. Preapproved credit card offers from banks I'd never heard of ...

The spam filtering will be at the server level. There might be some options visible to you when you log in that let you block senders, or maybe white list to your address book (in the Comcast Mail ...