A good e-mail policy in place will secure your company in several ways. Firstly, the e-mail policy helps prevent e-mail threats, since it makes your staff aware of the corporate rules and guidelines, which if followed will protect your company.
If an incident does occur, an e-mail policy can minimize the company's liability for the employee's actions. Previous cases have proven that the existence of an e-mail policy can prove that the company has taken steps to prevent inappropriate use of the e-mail system and therefore can be freed of liability.
email2 allows companies to monitor message content in 'real time' (Data Leak Prevention) to ensure that the rules and guidelines are being adhered to demonstrating good corporate governance reducing the costs of employee education and retention. It also secured every transaction ensuring that your information does not end up in the wrong hands. Finally, it gives the corporation the necessary tools to audit usage, and block at the source who your employees can communicate with.
//Edited November 2009