BTW, From MUST be signed twice, because it is a mandatory frozen/singleton header. You can't have more than one From header. It should not be easy to change this. It is still possible with the current API, and that's ok.
BTW, From MUST be signed twice, because it is a mandatory frozen/singleton header. You can't have more than one From header. It should not be easy to change this. It is still possible with the current API, and that's ok.