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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?

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  1. Tools > Account Settings

  2. Then select the account. Doesn't matter if you have multiple accounts, it'll still work the same

  3. Click Manage Identities

    • The dialog window "Identities for [account name]" will appear
  4. Click Add

    • The dialog window "Identity Settings" will appear
  5. Fill in the details using the forwarding email in the "Email Address" and "Reply-to Address" fields

  6. Click OK on the "Identity Settings" dialog

  7. Click OK on the "Identities for [account name]" dialog

  8. 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.

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Sometimes this one doesn't work properly. I've got an Outlook account with an alias which I also use for a mailing list. I tried to set that alias to send e-mail from Thunderbird in the way you described. It still sends mail from my original address. – uomoinverde Nov 17 '14 at 17:56
At Thunderbird 31.7.0, "Account Settings" (1) is on the "Edit" menu. – Rhubbarb May 19 '15 at 22:09

Try the Virtual Identity extension. This will allow you type into the From field. However, be sure you SMTP provider will allow you to send from a false (for them) email address.

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There is another, very lightweight addon called EDITSENDER. It allows you to edit From:-details on the fly for each message you write (As long as your mail-server accepts this).

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This one worked well for me. I did tried the most-voted method first, but it didn't work until I've installed this addon. – uomoinverde Nov 17 '14 at 18:10

Add your forwarding address as a POP3/SMTP account in thunderbird. Then, make sure you uncheck the POP3 account settings options "check for new messages" and "automatically download new messages" so you don't actually download the messages from your forwarding account

For Thunderbird 3, the steps may be a little different.

Then, when you go to send a message, just select the account you wish to send from.

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