Best email-encryption tools

Add email encryption while keeping an existing address

Device-side encrypted email with identity-verification options

Encrypted mail with recipient authentication and access revocation

OpenPGP email support for SeaMonkey and Epyrus

OpenPGP mail and file encryption for Outlook on Windows

PGP encryption integrated into Gmail

Gmail encryption with organization policy and access controls

OpenPGP encryption and key management on iPhone and iPad

Swiss domain email with administration and protected-message options

OpenPGP encryption in existing webmail accounts

A command-line mail client that accepts prepared encrypted messages

Automatic outbound mail encryption with a fallback recipient link

Centrally managed S/MIME and PGP with a webmail fallback

Secure client messages and files through browser, Outlook or Gmail

Healthcare-oriented email with automatic encryption and integration hooks

Encrypted hosted mail with an explicit outside-image limitation

Encrypted messages for an existing email address and Outlook workflow

Policy-driven encryption with several recipient delivery methods

Encrypted attachments and messages within Outlook and Gmail

OpenPGP signing and encryption inside Apple Mail

Central S/MIME and PGP with an encrypted-PDF fallback

Policy-based email encryption and outbound data controls

Encrypted email and intake forms for professional practices

Paid email accounts with a documented encryption-centered design