The Messaging Security Agent uses the following sequence
to scan email messages:
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Scans for spam (Anti-spam)
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Compares the email to the Administrator’s Approved/Blocked Senders list
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Checks for phishing occurrences
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Compares the email with the Trend Micro supplied exception list
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Compares the email with the Spam signature database
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Applies heuristic scanning rules
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Scans for content filtering rule violations
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Scans for attachments that exceed user defined parameters
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Scans for virus/malware (Antivirus)
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Scans for malicious URLs