Not able to access email, server error

My husband can log in to his Comcast email but his In-box doesn’t load. A message comes up that says “an error occurred inside the server which prevented it from fulfilling the request.” I spent a good portion of the day on Sunday taking with their support, they assigned a ticket number but don’t call back with any updates. When I call back they ask me the same questions, things we’ve already tried on 4 different devices.  He has not been able to get his email in box for 27 hours. He also can’t send an email. We have been Comcast customers for 19 years. The last support person I called asked me the same questions I had been asked on the last 3 calls, then hung up. Can someone please help?