One-Click Unsubscribe for KMail

This is an initial attempt to provide support for RFC 8058 One-Click Unsubscribe to KMail.

This is still a work in progress, but appears to work. Sadly, One-Click Unsubscribe is difficult to meaningfully test.

Requirements

This was built using Qt6 and the following KDE Frameworks:

Additionally, the following KDE PIM libraries are required:

This plugin is built using CMake.

$ cmake -Bbuild .
$ cmake --build build
$ cmake --install build

Once installed, the Unsubscribe button can be added to the KMail Toolbar by right clicking it and selecting "Configure Toolbars...".

See LICENSE.txt.