this is a mail server issue. ask your admin to fix that.
to eliminate any doubt about that verify that the problem still exists
with a fresh profile.
** Changed in: thunderbird (Ubuntu)
Status: Incomplete => Invalid
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thunderbird fails to email via smtp with message "An error has occurred sending
mail: SMTP server error. The server responded: Unknown command contact your
administrator for assistance"
https://bugs.launchpad.net/bugs/273933
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