If you ever needed to select a different SMTP server while sending mails in Thunderbird you can now by installing the Send Via add-on for Thunderbird. The add-on can come in handy if the main SMTP server is not accessible at the moment or having accessibility or connection problems.
The Thunderbird add-on is available for all versions of Thunderbird 2. It is currently available as a experimental add-on at the Mozilla website from where it has to be downloaded before it can be installed in Thunderbird.
The add-on will add a drop down menu to the Send button in the Thunderbird email client which will list the available SMTP servers and an option to add a new SMTP server to use it to send the emails.

Selecting any of the available SMTP servers will send the message by connecting to the specified server.
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