What I meant is it’s trivial to change the content type and to change the attachment format so it doesn’t match specific GPG formats. The content type is done

What I meant is it’s trivial to change the content type and to change the attachment format so it doesn’t match specific GPG formats. The content type is done now for convenience, but there’s nothing stopping me from using GPG to generate a message and send it with the content type of a text file or zip or whatnot. Of course there are other methods, but GPG is free, stable and works as expected.