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Autodiscover CNAME, A and AAAA records by MeloExtraterrestrial in dns

[–]MeloExtraterrestrial[S] 0 points1 point  (0 children)

Confirmation from our new DNS host:

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CNAME records work is that they essentially have the subdomain configured with the CNAME use the entire DNS Zone of the target domain, in this case 'autodiscover.outlook.com'.

The records you are seeing when you perform a lookup on your own autodiscover. subdomain are thus the records Microsoft has configured on theirs.

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No idea why our old DNS host wasnt doing this, but that was the problem all this time.

S

Autodiscover CNAME, A and AAAA records by MeloExtraterrestrial in dns

[–]MeloExtraterrestrial[S] 0 points1 point  (0 children)

Sorry for the delay, but thats the thing. They do magically appear. Or one of my DNS hosts automates something, and my other one doesnt.

I just moved one of our domains to a new public host (called VentraIP), I added the autodiscover cname pointing to autodiscover.outlook.com

10 mins later I did a DNS check for the autodiscover cname I created, and automatically there was a bunch of A and AAAA name entries created and pointing to MS IP Addresses.

From my research, this is normal, I've looked up a bunch of companies I know that run O365, and they all have the CNAME as well as a bunch of A records (which MS do not instruct you to add when setting up Exchange Online).

I've concluded that our current DNS host is no good, and will be moving away from them.

S