SMS Plus - SMS Plus app offers features that let you forward text messages through internet connection as well as through other social media platforms.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
NetSfere Secure Messaging - NetSfere Secure Messaging is a secure messaging app that enables you to send messages by using 256-bit device-to-device encryption features.
GPGMail - GPGMail is an open source plugin for Apple Mail.
PhoneLeash: SMS/MMS forwarding - PhoneLeash: SMS/MMS forwarding app offers features that let you forward your desired text messages and multimedia messages to your email or your other mobile phone so that you can access them later.
ElectronMail - Unofficial desktop app for ProtonMail and Tutanota end-to-end encrypted email providers