SMTPTracker extends your SMTP server with message tracking, content saving, sql logging and anti-spam abilities. SMTPTracker works with Microsoft SMTP service, Exchange Server 2000, Exchange Server 2003 and other systems based on IIS smtp service. Versions 1.0.50 and later extends Exchange Server 2003 with ability to route detected SPAM to users' Junk Mail folders. This feature we called SCL Routing. With SCL Router Chaining SCL headers can be passed from front-end server not running Exchange 2003 to Exchange 2003 back-end server. SMTPTracker is free for nonprofit organizations.