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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.

To install download the file provided on the website, then in Thunderbird 'Menu: Tools > Add-ons > Gear Icon (Tools for all Add-ons) > Install Add-on from File...', and restart your Thunderbird.

Usage is straightforward, click on greenish area to edit, click on white background area to choose any stored identities.

Thunderbird Edit From Header enter image description here

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Their SSL-enabled download site raises a security warning in Firefox. See github.com/absorb-it/Virtual-Identity/issues/10 – akaihola Feb 20 at 8:21
    
@akaihola: Their certificate is signed by CaCert. For some reasons, this free Certification Authority is not pre-installed in your browser. If you verify and install the CaCert Root Certificates, absorb.it verifies just fine. You still have to trust absorb.it to play nice, but that's not an certificate issue :-) – Vincent Mar 15 at 10:47

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).


Edited to add (2016-03-15): It has to be noted that the add-on is not part of the official mozilla ecosystem. There is no external verification-process for this add-on, and it might do nasty things to/with your data at any time.

The old Link to nic-nac-project.org currently raises certificate errors. The new link to freeshell.de seems to be a bit more trustworthy.

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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
    
The linked site raises a security warning in browsers – that means the download shouldn't be trusted. – akaihola Feb 20 at 8:23
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My testing show that even though you can modify the 'From:' header it no longer seems to work with Thunderbird 38.6.0 - I have reported the issue to the author, but Virtual Identity Extension (absorb.it/virtual-id) did work. – Daniel Sokolowski Mar 6 at 14:42
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@DanielSokolowski: I can confirm that. I will not change the answer, yet, as I still hope that the author will fix it soon. – Vincent Mar 15 at 10:33

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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