The Domain-based Route page of the Configuration Wizard lets you identify a domain that you want protected and designate the SMTP server to which mail to this domain should be sent. You can add more protected domains in the Settings > Inbound/Outbound > Mail Routing page. See Protected Domain group for information about protected domains.
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Designate a protected domain in the Protected Domain Name field.
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Mark the Require Authentication check box to force a user to enter username and password credentials. Enter the username and password that must be used.