Exchange Online, Autodiscover CNAME resolving to wrong server

I've created all the Office 365 records, and when you check it resolves correctly.

However when I run an autodiscover test using, the record ends up resolving to, rather than the autodiscover CNAME record I've set up. I'm unclear how to resolve this.

Thank you in advance for your help.
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Guy LidbetterCommented:
Do you have the External DNS correctly configured?

I assume when you say you've created all the record you've done it both internally and externally?
itbrainsAuthor Commented:
Hi Guy

Yep - DNS all reports fine .. if you ping it resolves correctly.  This is using Exchange Online so not sure what you mean by Internal/External.  Our clients resolve DNS queries against OpenDNS servers.
Guy LidbetterCommented:
Yeah, from what I can see it all looks fine...

Odd one for sure. Have you contacted OpenDNS about it?
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itbrainsAuthor Commented:
Not specifically ... when running the Microsoft Connectivity test (, it seems to be picking up the SSL certificate for the website and resolving to that instead - does that help?
Guy LidbetterCommented:
Are you saying that your certificate for exchange has the SN of
itbrainsAuthor Commented:
To the best of my knowledge we have an SSL for the website only which resolves to the address shown above.  We dont have an SSL for email, as it's hosted by Microsoft, (Exchange Online), so dont need one.
Vasil Michev (MVP)Commented:
Autodiscover has several endpoints, both ExRCA and Outlook will first do a lookup on the HTTPS endpoints. The process is explained here in details:

If all your mailboxes are located in O365, the only thing you need is the "HTTP redirect" endpoint.

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