About a month ago, ads started showing up in my email account. I always unsubscribe, but the ad emails keep coming. How do I stop them?
By unsubscribing to any spam mail you let the spammers know they've "hit" a live email address. Never unsubscribe!
Your best bet is to mark those as spam. It will take a while to train the Comcast filters, so continue marking those as spam and eventually they will slow down and go away.