I see. Anyway IMO it would be good to pursue compliance to the specification. Or at least try to be compatible with other MUAs doing so.
One example of a MUA like this is mutt.
Don't require non-standard protected-header="v1" attribute
This indeed works, thanks! It would be helpful to add this info near custom gpg path setting, specifically that: - the setting is ignored by pEp - pEp needs to be disabled before account setup to use custom gpg path
custom gpg path ignored in some cases