My OS in Windows 7. I'm using Thunderbird 3 from my home to access office mails. Though my office mail server doesn't support POP3, Thunderbird automagically configures itself when I provide it my email id and password. It can download emails and synchronize with server. However, I get following error when try to send a message:
Sending of message failed. An error
occurred sending mail: Unable to
authenticate to SMTP server
smtp.[omitted].com. It does not
support authentication (SMTP-AUTH) but
you have chosen to use authentication.
Uncheck 'Use name and password' for
that server or contact your service
provider.
I didn't find anywhere from account settings dialog box a check box saying Use name and password. I tried disabling secure authentication by unchecking the check box Use secure authentication in Server Settings dialog box but it didn't solve the problem.
Any idea how to get rid of this problem? Thanks for your time.
Best Answer
http://getsatisfaction.com/mozilla_messaging/topics/thunderbird_2_to_3_0_upgrade_unable_to_authenticate_to_smtp_server_uncheck_use_name_and_password_for_that_server