Extension for Mozilla Thunderbird which adds support for the X-Unsent header.
Opens .eml message with the "X-Unsent: 1" header directly in edit mode.
The add-on can be downloaded from https://addons.thunderbird.net/thunderbird/addon/x-unsent-support or https://github.com/lieser/X-Unsent_support/releases. The source code is available at https://github.com/lieser/X-Unsent_support.
Support is given at https://github.com/lieser/X-Unsent_support/issues or by e-mail to lieser+xunsent@posteo.net (in English or German).
The preferred way to report bugs is by creating an issue at https://github.com/lieser/dkim_verifier/issues.