Hi Team,
Hope you are doing good.
I have an office 365 domain that i have verified/added and DNS records published, Consider this Domain to be Contoso.com
I have added a subdomain in office 365,lets call it xyz.contoso.com, though I have not published any office 365 DNS record for the same in DNS registrar.
I created a user keeping Primary SMTP with @contoso.com and created an alias of the same user with @xyz.contoso.com
When an external user addresses an email at @xyz.contoso.com, mail gets successfully delivered/received.
How is DNS query working here when I have not created any DNS record in this regard for this domain?
Another scenario is, when i change primary smtp to @xyz.contoso.com and address an email to the same, mail delivery fails, why?
Please help me in understanding this.
Thanks,
Harshit Malhotra