Email Access on my cell phone for my comcast.net email acct

Hi,

I access my email acct on my cell using the cell phone app that was pre-loaded on it...as of a week ago I keep getting "Theres an issue receiving email in this acct" messages and when I go to recover it says that it is temporarily blocked...I have been using this app for years and now it always does it when I leave the house...it will not allow me to reconnect until I get back home...today it started doing it at my house...I do not have a paid xfinity acct anymore as I moved from CT where I had an acct to SW VA and Xfinity is not available...

When I access email via the web at home I have no issues, only on my cell phone...any ideas as I cannot get a hold of a live person at xfinity to help..thanks  Steve