email sometimes, just deosnt work

My Comcast email sometimes just doesn't receive mail. I've had to go through Gmail or other mail sites for schooling and otherwise, since sometimes this is locked up tighter than Fort Knox for things that actually matter, while allowing an unending spew of spam to go through perfectly fine, but there's no other way to get in contact with literally anyone without dedicating massive amounts of time for basic issues even, and your on site ai is practically wothless, currently trying to get password resets from other sites, and theyre sending to my comcast, say they sent, and yet my inbox remains empty, despite recieving things from them in the past perfectly fine