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[–] 3 points 2 years ago

This is built into Thunderbird for a while now.

https://i.imgur.com/065RFJJ.png

  1. Go to Account Settings
  2. Enable Reply from this identity when delivery headers match
  3. Enter your domain prefixed by a wildcard (*), for example *@yourdomain.com
  4. Close/confirm all your changes
  5. Open an email that was sent to one of your catch-all addresses and click the reply button.
  6. The FROM field should be the catch-all address and not your general address.
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