Requirements

• Windows 2000/2003 - Pro, Server or Advanced Server or Windows XP Professional.  
• IIS5 SMTP service installed and running as an SMTP relay to your mail server.  
• Microsoft Exchange server 2000, 2003, 4, 5 or 5.5, Lotus Notes 4.5 and up, or an SMTP/POP3 mail server.  
• For the list server feature, Microsoft Message Queueing Services is required.