I subscribed to a mailing list under a forwarding e-mail address. But Thunderbird sends mails from my real address (a GMail account). I tried to send my first message to the list today, but it got rejected because "The email address used to send your message is not subscribed to this
group." Is there a way I can put my forwarding e-mail address on my messages instead of my real one?
Changing the From address in Thunderbird
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What you describe is actually how (recent versions of) Thunderbird operate by default. Each account's default identity is linked to the mailbox that is picked up via IMAP/POP. You've changed from the default, per your description.
Furthermore, adding multiple identities to the Google Mail account will cause Thunderbird to pick the appropriate identity automatically when composing replies in that account. There's even a configuration option that tells it to pick identities from other accounts.
Go to "Extra->Account Settings". Click the "Manage Identities" button and add an identity (using your alternate email address).
Close the settings dialog and compose a new email. You can select an email address from the "From" dropdown in the top of the window:
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Tools > Account Settings
Then select the account. Doesn't matter if you have multiple accounts, it'll still work the same
Click Manage Identities
Click Add
Fill in the details using the forwarding email in the "Email Address" and "Reply-to Address" fields
Click OK on the "Identity Settings" dialog
Click OK on the "Identities for [account name]" dialog
Click OK on the Account Settings dialog
Now when you want to write an email, select the email address/identity you want as the outgoing from the "From:" field.