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Exchange Server provides integrated antivirus, anti-spam and anti-phishing technologies to stop the latest threats before they impact your business and employees.
Anti-Spam & Antivirus

 Sender ID
Exchange Server embeds support for Sender ID, an e-mail industry initiative designed to verify that each e-mail message originates from the Internet domain from which it claims to come based on the sender's SMTP (Simple Mail Transfer Protocol) server IP address. Sender ID helps prevent domain spoofing and protect legitimate senders' domain names and reputation and helps recipients more effectively identify and filter junk e-mail and phishing scams.
 Outlook E-Mail Postmark
Exchange verifies Outlook E-mail Postmarks attached to messages sent from Outlook. The Outlook E-mail Postmark can reduce false positives for messages from legitimate senders that have little to no sender reputation.
 Spam Assessment
In addition to scanning message content, the Intelligent Message Filter (IMF) consolidates guidance from Connection, Sender/Recipient, Sender Reputation, Sender ID verification, and Outlook E-mail Postmark validation to apply a Spam Confidence Level (SCL) rating to a given message. Actions on the message can be preconfigured based on this SCL rating. Actions may include delivery to the inbox or junk mail folder, delivery to the spam quarantine, or outright rejection and no delivery.

 Antivirus Protocol Rules
As a reactive defense mechanism, protocol rules provide a layer of protection before antivirus signature updates become available.
 Deep Integration for Antivirus Scanning
Antivirus solutions can be more tightly integrated in the Exchange Server environment. Antivirus solutions have access to the Multipurpose Internet Mail Extensions (MIME) parsers and—depending on the server—can scan the message stream in transport. Catching viruses in transport helps prevent their delivery and storage in Exchange mailboxes.

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