Apple Email Now No Longer Works!

My Apple email has been running fine for many years. Today it STOPPED.

Old emails still in Inbox and else normal but I suddenly stopped receiving email and now cannot receive any emails sent to my comcast.net account.

On Line Xfinity email works fine though not set up for hubby and myself.

Checked Apple Mail Acct settings they are all good. I believe....when Composing Email and hit send the "outgoing" whee

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l to just rotate.