Go to the General tab click the Advanced Choose the IP binding that that is listening on the Internet. Click the Edit Enable the Apply Recipient Filter option.
Click OK through all the windows to save your changes. When someone tries to send an email to a user that does not exist in your Active Directory domain, they will receive this error:. Then, assuming your domain has this Exchange server configured as its Destination Server, the Email Security Gateway should begin to reject incoming mail addressed to invalid recipients at your domain.
Recipient Verification is configured in the "Anti-Spam agents" module. Please follow this link to a Microsoft knowledgebase article below if you need to enable the "Anti-Spam agents" module on your Exchange server. Once you have verified that the Anti-Spam agents are enabled, you can configure Exchange to block mail addressed to recipients that don't exist at your organization. Microsoft Exchange setup requires that each domain in the existing Exchange organization have an instance of the Recipient Update Service.
If an instance of the Recipient Update Service is missing for a domain, new user objects created in the domain will not receive e-mail addresses issued to them. To resolve this issue, verify that an instance of the Recipient Update Service exists for each domain and create an instance of the Recipient Update Service for the domains that do not have one and then rerun Microsoft Exchange setup.
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We went to Exchange a year ago and removed our Exchange server also at that time. The service will not process updates in this configuration, please choose a non-Exchange Server server to host the service.
However, what do I do now as a result of this error since we removed our 2K3 server a year ago?
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