3.1.5.3 Locations Found from SRV DNS Records
An Autodiscover client can query DNS to obtain SRV records for the Autodiscover service by using the following query. For more information, see section 2.2.2. The query produces an ordered list of hosts. If no valid entries are found, then the query will return an empty list.
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_autodiscover._tcp.<domain>
If the result is <host>, add "https://"<host>"/Autodiscover/Autodiscover.xml" to the list of possible Autodiscover URIs.