ITA Secure Messaging's Enterprise edition is designed for large enterprises and Internet Service Providers who get millions of messages on a daily basis. The Enterprise Edition includes all features provided in ITA Secure Messaging Corporate Edition / MS Exchange, plus: Clustering ITA Secure Messaging clustering allows multiple machines to be used as one. Every machine in the cluster can accept emails (inbound and outbound). Administrators and users only connect to one machine to modify rules and view quarantined messages. Clustering provides: Scalability High availability Zero down-time Click here to learn more about clustering. Multiple profiles Profiles in ITA Secure Messaging define a set of rules used by the Rules Engine to determine the type of message. By having multiple profiles you can define different rules for different domains. For example the Accounting department can have a different set of rules than the Sales department. Multiple Administrators You can define multiple administrator - each responsible for a profile The Enterprise Edition of ITA Secure Messaging is designed for ISPs and enterprise requiring massive scalability, high availability. Compatible with virtually all SMTP servers including: Microsoft Exchange 5.5, 2000, & 2003 Lotus Notes/Domino GroupWise Sendmail Sun ONE Messaging server Netscape Apache James any other SMTP complaint mail server Runs on Windows, Linux, Solaris, AIX, HP-UX and others How does ITA Secure Messaging Work? As the name implies, ITA Secure Messaging Edition works just like a network firewall - it intercepts, inspects, and identifies ALL emails arriving into your network. Based on our state-of-the-art technology built into the ITA Secure Messaging Rule Engine, it intercepts spam emails and blocks them from reaching the mail server. Customizable options allow you to set the rules compatible with your business policies on which e-mails should be blocked and which emails should be let in. Our comprehensive system of archiving and our single-click restore option guarantees that not a single normal e-mail will be lost. The diagram below explains how ITA Secure Messaging works to block Spam.   When an email comes into your Network from the Internet: ITA Secure Messaging intercepts the message and forwards it to the ITA Secure Messaging Rules Engine. E-mails are evaluated, assigned a score by the Rules Engine and categorized as Good, Possible Spam or Spam. Depending on the results received from the Rules Engine, ITA Secure Messaging either archives email as spam or forwards it to your mail server for delivery to a user Inbox. More than one machine can accept incoming messages. Filtered messages can be sent to more than one target SMTP server.