Coexistence with Different SMTP Mail Domains

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This topic explains how to configure Exchange Server and a server running the Windows Server POP3 service to coexist using different SMTP mail domains. In this example, Exchange users use the SMTP mail domain, exchange.northwindtraders.com, and the POP3 user use the SMTP mail domain, pop.contoso.com. In this scenario, Exchange Server accepts e-mail for Exchange Server users with the address of exchange.northwindtraders.com and it also accepts e-mail for POP3 users with a different address, pop.contoso.com.

For detailed steps on how to configure Exchange Server and Windows server POP3 service to coexist using different SMTP mail domains, see How to Configure Exchange and Windows Server POP3 Service to Coexist Using Different SMTP Mail Domains.