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When I toggle encryption and signing off inside the compose message window and save the mail as draft, it's always encrypted.
Because I can't find an option for this behavior I guess it's a bug.

Edit:

thank you for the reply - this settings must have been added some time ago and I just didn't see it since then ...

Это отзыв для предыдущей версии этого дополнения (1.9.1). 

That's a feature, not a bug. You can turn off encryption of drafts in the account settings under OpenPGP Settings.