Steve on 10 Oct, 2018 04:39 PM
welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.
We have a ticket for this problem. I connected this discussion with the existing ticket. That means, should this discussion get closed, it will be re-opened as soon as the ticket is closed. That way you'll stay in the loop and get notified as soon as we have news. Feel free to open a new discussions should you run into further problems or need assistance.
This KB-article elaborates on why GPGMail may not work with unreleased macOS major updates and what to do if you cannot revert to a stable macOS release.
Please note that there is no official support for macOS pre-release versions. Should you rely on GPGMail for your productive work, please stick to the stable release channel of macOS.
Steve on 10 Oct, 2018 04:47 PM
It does. But we simply can't support developer versions (i.e. betas) of upcoming macOS releases. Apple keeps changing things and those changes are completely undocumented. You can find additional details about that in the KB I linked in my earlier reply.
The KB also has a link to an Apple Feedback Form if you think they should be providing an API for Mail.app and document changes.