Encrypted messages content shows up as attachment

I frequently exchange emails with someone , using PGP. When reading his email, the behaviour is completely random:

  • sometimes, all is fines
  • sometimes, the mail’s body shows up as a .txt attachment
  • sometimes, the mail’s body shows up as a .html attachment

This defies the purpose… all is fine when using Thunderbird. What can I do do debug this?

If you have a Pro License, you can open a support ticket with eM Client. 

Otherwise, you may have to wait for the next major release. I understand there are some issues with encryption that are being addressed by the developers, so hopefully they will be fixed.