Interoperation with mixgui (mixminion remailer for Thunderbird)
Please state in TorBirdy documentation, if TorBirdy is tested together with mixgui.
Please state if the use of mixgui is recommend, untested, tested, unsupported, supported, discouraged or whatever.
Perhaps install mixgui together with TorBirdy.
Of course, mixminion should run on the top of Tor.
It's up to you, to decide, if mixminion is worth bothering with. Maybe they could get some new users and popularity, due to integration into TorBirdy.