invisnet

WP PGP email allows you to add a PGP key to a user profile, and then encrypts any email sent to that user.
Based on a Gist by Tim Nash: https://gist.github.com/timnashcouk/dd1ff318489f6bfd8743
Uses <code>php-gpg</code> by Jason Hinkle: https://github.com/jasonhinkle/php-gpg
Requires PHP 5.3 or later.

WP PGP email

Eric Mann

Automatically encrypt certain WordPress messages using your GPG public key to ensure no one but you can ever read the message.
This is primarily used to secure password reset emails so, even if an attacker were to gain access to your email account, they couldn’t change your WordPress password.

WP PGP email vs Secure Messaging