You have to work out why it is failing. It is not something you "get around" You password and user name have been rejected. Why at this time I have no idea as I have nothing to work with. Perhaps you might try offering information on what the actual problem is. Things like; * What mail provider is causing issue? * Did the account used to work in Thunderbird? * Did you change your password on the server and not in Thunderbird? * What is the exact error message (verbatim)