The drop-down menu beside 'From' in the write window lists identities
you have set up, not SMTP servers or accounts.
If you want one entry in the drop-down menu to be the same name,
address, etc., but different SMTP server, here's how to do it:
1. Go to Tools-->Account_Settings.
2. Select the account you will be sending from, and at the bottom-right,
click [Manage Identities].
3. Click [Add].
4. Fill in the identity info the same as you already have set up for
that account, but at the bottom of the first tab, select a different
SMTP server.
After you have saved that identity, an additional item should be
available in the 'From' menu when composing a message.
For more info, see
<
http://support.mozillamessaging.com/en-US/kb/using-identities>.
If this is just a matter of changing your SMTP server depending on where
you are (i.e. how you're connected to the internet), you can set your
accounts to use the default SMTP server, then when you change
connections, just go to Tools-->Account_Settings-->Outgoing_Server, and
set another SMTP server as the default.
Additionally, there are some good extensions you might be interested in,
that let you switch SMTP servers on the fly.
See <
https://addons.mozilla.org/en-US/thunderbird/search/?q=smtp>
--
Chris Ilias <
http://ilias.ca>
Mailing list/Newsgroup moderator