- Make sure you install the latest service packs for Exchange 2003.
- Check the user SMTP address and//or creates a new one. Go to Active Directory Users and Computers, select User, right click on Properties, then click E-mail Addresses tab.
- Check the Exchange virtual directory. Go to Exchange System Manager, expand Recipients and select Recipient Policies. Click on Properties for the default policy and click on the E-mail address tab.
- Create additional SMTP domains and HTTP Virtual Servers. Start Exchange System Manager and expand Server name. Expand Protocols -> HTTP -> Virtual Server and right click New. Click Virtual Directory, type the name for a new directory and select SMTP domain.
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