Use this guide to help you to add a CNAME record to your domain on the Exchange service.

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Exchange 2013/2016 - CNAME

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What does the CNAME diagnostic button do?

The CNAME (or Canonical Name) diagnostic button appears in certain instances when a domain name has been declared on your Exchange platform.

The purpose is simply to verify that you are the administrator of the declared domain name.
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Why does this button appear?

Reasons:

  • The declared domain name is not registered with OVH. On declaration you selected: "Enter a non-OVH domain name owned by you".

  • The declared domain name is registered with OVH and points to the OVH DNS servers but is not managed with the same OVH Customer ID (NIC handle) as your Exchange service.

  • The declared domain name is registered with OVH but does not point to the OVH DNS servers.
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How to create the CNAME record

You will need to retrieve the information necessary for creating the record by clicking on the diagnostic CNAME button.
If the declared domain name is not registered with OVH:
Create the CNAME record with your DNS provider.

Here are two tools to enable you to determine the DNS provider: DIG and WHOIS

It is also possible that the DNS servers used are OVH servers.

In this case, create the CNAME record via the Web Control Panel.

What to do next will be explained below.
If the declared domain name is registered with OVH and points to the OVH DNS servers but is not managed with the same OVH Customer ID (NIC handle) as your Exchange service.:
The CNAME record must be created using the Web Control Panel via the account that manages the domain name.

Click on the relevant domain name, the "DNS zone" tab, then the "Add an entry" button.
Adding a CNAME entry in the DNS zone.
Add the CNAME entry using the information retrieved earlier, then continue to the next step for validation.

This type of operation will be applied very quickly - it should take no longer than an hour.
The declared domain name is registered with OVH but does not point to the OVH DNS servers:
You need to determine which DNS servers your domain name points to and then create the CNAME record with that provider. Use the DIG and WHOIS tools mentioned earlier to obtain this information.
DIG interface:
The DNS servers used are:

DNS108.ovh.net
NS108.ovh.net
WHOIS interface:
The DNS servers used are:

DNS108.ovh.net
NS108.ovh.net
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How to tell if the CNAME record has been added correctly

Adding a CNAME record is subject to DNS propagation, which may take between 4 and 24 hours, although this type of record is generally propagated very quickly, enabling you to continue with the configuration of your Exchange platform.

On refreshing your Web Control Panel, you should notice that the CNAME diagnostic button has disappeared and the new MX and SRV diagnostic buttons are now visible.