How to reject invalid emails in Exchange 2003 Server?

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By default the "Recipient Filter" is not disabled in Exchange Server 2003. To prevent unwanted emails not listed in your Active Directory, here's what you need to do.

• Open the ESM (Exchange System Manager) exchange management tool
• In Global Settings, right click on Message Delivery, then select Properties.
• In Message Delivery Properties, click Recipient Filtering tab.
• Put check on "Filter recipients who are not in the Directory">

Well you're not done yet, that's one part only. If you are not using a third-party anti-spam tools, you need to check your SMTP protocol setting. Here's how to:

• In ESM, go to Administrative Groups, First Administrative Group
• Expand Servers, then SERVER name.
• Expand Protocols, SMTP, right click on "Default SMTP Virtual Server" then Properties.
• In Default SMTP Virtual Server Properties, click Advance.
• In Advanced, click Edit
• Put check in "Apply Recipient Filter.

You don't need to restart your Exchange Server, now go check your anti-spam logs if traffic improve for your emails.

For Exchange Server 2007, I suggest you read this article from interjuncture.com website. Post comments or suggestions.

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