An user is sending an encrypted mail to one recipient. But the recipient gateway says "Mixed Security State - partially encrpyted". The recipient gets a mail with two attachments: txt and html. When he uses mail on the iphone instead of Outlook 2016 everything works fine. Also when he is answering the mail.
- User A sends a encrpyted mail to B by Outlook - Error Mixed Security State
- User B send a encrpyted mail to A and A answers this mail to B - OK
- User A send a encrypted mail to B by mail on the iPhone - OK