The tragedy is that they seem to have wrapped s/mime in some property nonsense to get this to work (see bottom of): https://support.google.com/mail/answer/1331

The tragedy is that they seem to have wrapped s/mime in some property nonsense to get this to work (see bottom of): https://support.google.com/mail/answer/13317990?sjid=1138879497655583224-EU https://support.google.com/mail/answer/13317990?sjid=1138879...