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email accounts from one domain are not accepted in Thunderbird

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Hello Friends,

It has been one or two weeks since my main business mail accounts have stopped working in Thunderbird on my office Computer. They are all from one domain, the other private mail accounts - also new ones - function without problems. First I have tried ereasing them and to install them new but none of the four existing mail adresses are acepted. The message I get is: "Login failed. Either the entered access data is incorrect, or other, separate access data are required" If I try again, Thunderbird says: "Thunderbird couldn't find any settings for your email account" The data I am using is absolutely correct and is working on several other machines like Laptop, smartphone, accountants PC etc. I installed MAILBIRD on the office PC and the COOLFLATS mail adresses work perfectly with the same access data ! I have completely reinstalled the office computer 3 days ago and nothing changed. I also noticed one remarkable thing: If I try to install one of the COOLFLATS mail accounts on a computer, where the "old" coolflats accounts are still working, I get the same error message as on my office computer. Now this is really weird, has anyone an explanation or a solution to this weird problem or am I forced to leave Thunderbird and move to the alternatives ?

Kind regards: Hardy

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