Thank you for taking the time to report this bug and helping to make Ubuntu
better.
Does this bug still exist? If yes: can you please check in the account
preferences what authentication method is used in the server preferences?
Normally TLS if possible should work fine, but sometimes other possibilities
need to be used.
** Changed in: thunderbird (Ubuntu)
Status: New => Incomplete
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sending password did not succeed. mail server... responded: authentication
failed
https://bugs.launchpad.net/bugs/339707
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