How to see mail.request.return_receipt thunderbird

To see the "Return Receipt" option in Thunderbird, follow these steps:

1. Compose a new email or open an existing one.
2. Click on the "Options" button (represented by three horizontal lines) in the top-right corner of the compose window.
3. In the "Options" menu, click on "Advanced".
4. Scroll down to the "Return Receipt" section.
5. Check the box next to "Request a return receipt" to enable the feature.

Alternatively, you can also use the keyboard shortcut "Ctrl + Shift + R" (Windows) or "Cmd + Shift + R" (Mac) to toggle the return receipt option on or off.

Once you've enabled the return receipt option, the recipient will receive a confirmation email when they open your message. This confirmation email will contain a copy of the original message, so be aware that this may not be suitable for all types of emails.

Note that the return receipt feature is not supported by all email providers, and some may have specific requirements or restrictions for using this feature.