Applies to: Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-05-30

This topic provides information about how to troubleshoot situations when the IP address of your organization's sending server is blocked by another Microsoft Exchange Server 2007 organization.

This problem can occur when the one or both of the following conditions are true:

If you cannot send mail to another Exchange 2007 organization because your IP address is on an IP Block list, do one of the following:

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