You seem to have the opposite problem to me , I had to put yahoo mail app on my tablet because the Samsung email app would not sync. On my pc mozilla thunderbird cant talk to the bt server and if I go onto the server itself I get the standard "we have a problem bubble"
As a bt customer , like me , you cant do anything about it. Over the past 6 months at least this has become a regular problem , everything works ok then for a few days the bt server refuses to talk to anything. Ignore the problem comments on the home page you can still look at emails clicking the top right email tab , yes its a pain but the only choice is move to another isp ….. am thinking of doing just that.
BTW... if you ring the help desk ( in india ) you will hear loads of operators in the background telling customers they have a virus , to the best of my knowledge this has been their stock answer for at least the past 16 years.