How to use the new DNS SRV lookup method to locate the Exchange 2007 Autodiscover service
To use the new DNS SRV lookup method in order to locate the Exchange 2007 Autodiscover service, follow these steps.
Note You must create the Autodiscover SRV record in the external DNS zone that matches the right side of your user’s SMTP addresses. For example, if a user’s primary SMTP address is firstname.lastname@example.org, the record must be created in the contoso.com external DNS zone. If you have multiple primary SMTP address domains in your organization, you must create an Autodiscover SRV record in each zone.
- In your external DNS zone, remove any HOST (A) or CNAME records for the Autodiscover service.
- Use the following parameters to create a new SRV record:
Service: _autodiscover Protocol: _tcp Port Number: 443 Host: mail.contoso.com