iOS is up-to-date and using iPhone 6 Plus Yesterday evening my sister-in-law and I were emailing. She replied to me from my original email. So far, so good. I replied to that email and she replied back with a subject change of "Encrypted email?" The short reply back from me was received encrypted on her iphone. I did nothing different. I started a new email thread and everything was fine. Today, I started another email to update her on a purse I am making for her granddaughter (my great-niece). We were good for a while. I just received a reply from her that came through to me encrypted. I am assuming they are encrypted. There is all sorts of text, equal signs, blue text, symbols, etc. Every once in a while I see a wors or two from the emails. What is causing this? I don't know if it is my end or hers. We both had it happen with emols we sent after sending and receiving normal texts. This is very annoying. Thank you for any assistance.