

Virtru: Compatible with Outlook, Hotmail, Gmail, Yahoo, and a few other email providers, this service allows for end-to-end encryption.Ciphermail: This is a completely free service that supports encryption through PDF, TLS, OpenPGP, and S/Mime protocols.

With ProtonMail, you can enable PGP encryption to protect sensitive data. ProtonMail: This service allows you to choose from both free and paid plans depending on the number of encrypted messages you plan to send.A few notable providers of email encryption service include: Similarly, Android devices can send encrypted emails but, again, you’ll need a third-party and extra setup to do it.

Yahoo utilizes Secure Sockets Layer (SSL) but needs a third-party service for higher level encryption.
