The Exchange Server Intelligent Message Filter (IMF) is part of a comprehensive effort to enhance e-mail protection, security, hygiene, and productivity. IMF is designed to combat the influx of unsolicited commercial e-mail and to enable users to distinguish between legitimate e-mail messages and unsolicited spam. Based on SmartScreen technology, Exchange Server 2003 IMF provides server-side message filtering, heuristics-based message analysis, and support for per-message spam confidence level (SCL) ratings.The Exchange Server 2007 implementation of IMF includes anti-phishing capabilities to help detect fraudulent links or spoofed domains and to help protect users from identity theft. Exchange Server 2007 customers are protected from emerging spam and phishing exploits through the automatic filter updates, which are published frequently. In addition to filtering messages by content, IMF consolidates guidance from Connection, Sender/Recipient, Sender Reputation, Sender ID verification, and Outlook E-Mail Postmark validation to apply an SCL rating to a given message. Administrators can use this SCL rating to preconfigure actions to be taken when a message is received, such as delivering the message to the inbox or junk e-mail folder, delivering it to the spam quarantine, or rejecting it.
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