MailDetective   
http://www.advsoft.info

MailDetective is a slim monitoring application designed to control mail use in corporate networks. It is a solid solution against frivolous employees who undermine corporate discipline and decrease productivity by sending and receiving non-work related emails. It can also help to reduce the damage from the bandwidth misuse which costs companies millions of dollars a year. MailDetective analyzes mail server log files and provides the employer with detailed reports about private and business emails coming to and from the corporate network as well as traffic distribution by users and email addresses. You can instantly see information about email usage in the entire company, by particular employees or during specific time intervals. These reports have a well-defined layout and deliver information in a clear fashion. A typical mail-by-recipients report contains such categories as email addresses of senders, local mail traffic, external mail traffic and traffic ratio. With such reports, you can monitor email traffic generated by your employees, expose non-work related emails and stop abusers. The program can be run in the interactive or console mode. In the interactive mode, you have the ability to customize the program settings, import log files manually, create reports with the Report Wizard or one of the previously saved templates, save reports in the HTML or MS Excel format. You can also view and print generated reports from the built-in HTML browser. The console mode allows you to automate the entire monitoring process from the importing of log files to generating reports, saving them to disk or sending them to a specified email address.

Aloaha SPAM rejector   
http://www.aloaha.com

Innovative server based AntiSPAM Solution. Incl. Sender Policy Framework and Sender ID Support! Does not depend on IIS or Exchange. Works together with every SMTP Server. Mail archiving, Remote Black-/Whitelists, relaxed greylisting, script engine and lots of other features. Does not accept spam. Rejects spam before reaching the SMTP Server. Now also with POP3 Interface (downloader) and SINK Plugin! .