As part of the Hub Transport server installation, a default accepted domain is created as an authoritative domain for the ...

As part of the Hub Transport server installation, a default accepted domain is created as an authoritative domain for the Exchange organization. The default accepted domain is the fully qualified domain name (FQDN) for your forest root domain. You may want to add authoritative domains for your organization, such as external SMTP domains that differ from your internal SMTP domains. Accepted domains include both authoritative domains and relay domains.
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