Topic Last Modified: 2009-03-19

This topic describes how to troubleshoot a non-delivery report (NDR) message that occurs when you try to send an e-mail message to an e-mail address that includes a special character. For example, the address may include an apostrophe (').

When you try to send an e-mail message to a recipient outside a Microsoft Exchange organization, and the e-mail address includes a special character, you may receive the following NDR message:

Requested action not taken: mailbox unavailable.

To resolve this issue, do not include the special character in the e-mail address.

To ensure that you are reading the most up-to-date information and to find additional Exchange Server 2007 documentation, visit the Exchange Server TechCenter.

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