This module is written natively for Joomla, and so takes advantage of Joomla's security functions.
It is very easy to install, you just use the Joomla! installer. The only thing that you need to remember is to set the from email address through the module parameters, otherwise it will not work.
The module also allows for a bcc field, and includes spam and email filtering. It is designed to be reasonably spam-proof.
*********** News *****
Version 2.0.1 Fixes a problem with a missing div closing tag in the module output
Version 2.0.0 is now compatible with Joomla 3