[ubuntu] Cannot send mail from thunderbird

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http://ubuntuforums.org – I have a new install of Ubuntu and Thunderbird The email accounts have been set up exactly the same as on another computer where I can send mail. No mail will send. I have deleted the profile files from the new install and copied the profile files from the other computer. Still no mail will send. I can download mail, no problem there. Any idea what's up? Greg (Hardware)