Google is adding two features to its Google Message Security, a hosted service for monitoring and managing email systems that filters message content based on pre-established policies and protects against spam, viruses and other threats.

Google will upgrade Message Security by making it possible for a copy of a message to be delivered to two different email hosts and by simplifying the calibration of spam and virus protection parameters, the company said. The new Dual Delivery feature will come in handy when organisations are migrating from one email platform to another, as well as when they want to set up a secondary email repository for backup purposes, according to Google.

Meanwhile, Health Check introduces a new reporting capability to assist email system administrators in establishing the right level of virus and spam detection, so that it's enough to protect the platform without being excessive and disrupting users' workflow.

Google Message Security, which is based on technology Google acquired with its purchase of Postini, is included at no extra charge with the Premier edition of the Google Apps collaboration and communication suite. However, organisations that don't use Google Apps Premier can still sign up for Google Message Security, which costs $12 per user, per year when purchased as a standalone service.

Google acquired Postini in July 2007 for $625 million in cash, a move directed at boosting Google's enterprise software unit and making Google Apps a more viable product for large organisations that have sophisticated email compliance, management and security requirements.