You may want to create the external dns record for your to autodiscover service for your outlook configuration(if your exchange server has the outlook anywhere enable)

  1. In your external DNS zone, remove any HOST (A) or CNAME records for the Autodiscover service.
  2. Use the following parameters to create a new SRV record:
    Service: _autodiscover
    Protocol: _tcp
    Port Number: 443
    Host:  (the url has your ssl certificate

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