Using Outlook Anywhere with multiple domains and a single SSL certificate

I had a customer with a primary SMTP domain but a couple others for certain individuals within the business. The SSL cert was a wildcard bound to the primary SMTP domain and Autodiscover/ Outlook configuration would fail for other SMTP domain logons.

I read various articles on changing IIS for redirects etc
http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/exchange-autodiscover.html
http://www.msexchange.org/articles-tutorials/exchange-server-2010/mobility-client-access/using-autodiscover-large-numbers-accepted-domains-part1.html

However I found the simplest solution was to remove the autodiscover A record for the secondary domains (internal & external) and replace with a single SRV record pointing back to the primary domain.

Service: _autodiscover
Protocol: _tcp
Port Number: 443
Host: mail.primary.com
Priority: 0
Weight: 0

http://markgossa.blogspot.co.uk/2015/11/exchange-2013-2016-autodiscover-with-multiple-domains-and-single-name-certificate.html

 

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