This user guide will help you redirect e-mails in Thunderbird using the Simple Mail Redirection add-on. When you redirect an e-mail, the original sender address is retained. It is also not possible to change the content of the e-mail.
1. Installing the Simple Mail Redirection add-on
Open Thunderbird.
Click the menu icon ☰ in the top right corner.
Select Add-ons and Themes.
Search for Simple Mail Redirection using the search field.
Click Add to Thunderbird to the right of the Simple Mail Redirection add-on.