Security Through Awareness
Here at Thumbprint Security, our focus is on secure email systems. We try and find that balance between security and convenience we all face in our online communications.

S/MIME Plugin - $500
The S/MIME plugin for Atmail 6.
This plugin provides the means for communicating securely using electronic mail. We provide a way to create, import, export and add contacts certificates! From the user interface you can both sign and encrypt your messages to users in your contact list that you have certificates for. Read more about S/MIME
OpenCompose Plugin - FREE
This plugin allows you to open the Atmail compose screen directly from an external link. It can also pre-populate the To: field with an email address.
To use the plugin you should use links with the href formatted as such: http://$domain/$path/index.php?opencompose=1&to=someone@domain.com where $domain should be replaced with the domain name of your Atmail server and $path should be replaced with any path information required to point to the Atmail installation. So you basically point to Atmail's index.php and append "?opencompose=1&to=someone@domain.com" (replacing someone@domain.com with the required email address, if any) and when the link is clicked it will open Atmail with a fresh compose tab open! Please note that you must be logged into your Atmail account for the link to work.
Download for free