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Old 22nd August 2011, 19:35
till till is online now
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Please post the exact messages that get added to the file /var/log/mail.log when you try to send a email.

A common problem with thunderbird is that it saves a wrong username in the smtp settings when you create a account. Please open thunderbird account settings, go to smtp and check the usersername in the smtp settings. The username must be the full email address and not just the part in front of the @ sign.
Till Brehm
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