Forum Discussion
External DNS records required for email in Office 365 (Exchange Online)
Hi all, we have a configuration with an OnPrem Exchange Server 2019 Infra in hybrid with Exchange Online. Looking at the MS documentation avaliable at this link: https://learn.microsoft.com/en-us/m...
you're mentioning what can be found in the documentation i linked in my first post, this is not useful.
In a Hybrid Configuration Exchange OnPrem and Exchange Online are federated. Does this mean that this CNAME record is recommended? If yes: is it recommended also if part of mailboxes are online and part are onprem? Which is the configuration seggested for the record? Must it point to autodiscover.outlook.com?
Thanks
Elie is 100% correct. The documentation that you refer to is related to external DNS and in a scenario where all mailboxes are located in Exchange Online and none are located in on-premises Exchange. If that is your scenario, then create a CNAME record for autodsicover.<your domain> that points to autodiscover.outlook.com.
If you have mailboxes located on-premises (even if it's just a few) then you need to keep the external DNS record for autodiscover pointing to your on premises Exchange server. You will need to keep this configuration in place until all mailboxes are migrated to Exchange Online (or at least all those mailboxes an Outlook client connects to)
If you have mailboxes located on-premises (even if it's just a few) then you need to keep the external DNS record for autodiscover pointing to your on premises Exchange server. You will need to keep this configuration in place until all mailboxes are migrated to Exchange Online (or at least all those mailboxes an Outlook client connects to)