Add roundcube-plugin-enigma package version 1.2.1, it is part of
official roundcube.

Enigma Plugin for Roundcube

This plugin adds support for viewing and sending of signed and encrypted
messages in PGP (RFC 2440) and PGP/MIME (RFC 3156) format.

The plugin uses gpg binary on the server and stores all keys
(including private keys of the users) on the server.
Encryption/decryption is done server-side. So, this plugin
is for users that trust the server.

(taca)