unable to send or recieve email

unable to configure outlook for my comcast and spectrum emails; spent 3 hours on voice call with microsoft yesterday and the result was that comcast/xfinity is blocking my messages; can send and receive for comcast if I use their cloud, but not for spectrum.  Initially,it was thought to be a problem with outlook,but microsoft techs say its the ISP is somehow blocking me........................the email worked find until about 8 months ago, when service ceased.  Using a desktop, a laptop and phone, and all work just fine when I am on the spectrum servers (elsewhere, not in my house that is).........can someone assist?