When you configure an Internet Mail Service connector for incoming e-mail only in Microsoft Exchange Server 5.5, some of the e-mail messages that you send may not reach their destination.
Additionally, there may not be any e-mail that remains in the SMTP e-mail queue. If you use the MDBView utility to view the Information Store e-mail queues, you see that messages are routed through the Internet Mail Service connector. Because the Internet Mail Service connector is configured for incoming e-mail only, the messages are not delivered successfully.
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