The autodiscover service is critical to the proper functioning of a Microsoft Exchange Server 2016 infrastructure. Additionally, the autodiscover service may be utilized using SCP for domain joined clients or DNS records for external clients. The DNS records and associated URLs will be utilized, in the order below, to find the autodiscover XML file. More information regarding autodiscover may be found here.

A or CNAME (https://domain.com/Autodiscover/Autodiscover.xml)

A or CNAME (https://autodiscover.domain.com/Autodiscover/Autodiscover.xml)

A or CNAME (http://autodiscover.domain.com/Autodiscover/Autodiscover.xml)

SRV (autodiscover._tcp.domain.com)