Safester

"Safester is an OpenPGP email encryption application - created in 2019 by Kawansoft (directed by Nicolas de Pomereu). Only available on the App Store for iOS devices, Safester works just like any other email application - just write a message, attach files, and add recipients.
You do not need to manage keys or encryption settings - Safester does all this for you. You receive notifications in your regular inbox when you receive a Safester message. "