I have a domain registered with an external registrar (marcaria.com). It is configured to be handled by Office365. (DNS name servers set to ns1 (and ns2) .bdm.microsoftonline.com). I have a contracted newsletter agency, who wants to use a subdomain to send out newsletters.
They asked me to create a subdomain and delegate the NS record to them. Turns out this can't be done in Office 365 – I couldn't create subdomains with NS records. (Did I miss something?)
Since NS failed, they gave me a list of A, TXT and MX records to create. I could create the A and TXT records, but I don't see MX as an option.
In Admin/Domains/mydomain.com, in the DNS Settings, I have a New custom record button, but that only allows the creation of TXT, A, CNAME and AAAA records. No MX. There is a section that says Exchange Online records, and one of my created TXT records was automatically put there, but I can't add records to that section. (Also, now I can't delete that TXT record which was automatically moved here, which is a worry. There is an edit button next to it, but no delete. Can change it, can't remove it. Sweet.)
So, any ideas? Is this even possible in Office 365 (delegating a subdomain, like newsletter.mydomain.com)?
Thank you!
Best Answer
If you select Office 365 as your DNS provider you CANNOT host email or IM with another hosting company.https://support.office.com/en-us/article/Can-I-add-custom-subdomains-or-multiple-domains-to-Office-365-5481401f-7771-490e-b728-b3a81305a32e
If you want to add a subdomain or your domain you MUST change your DNS management to a DNS provider other than Office 365.https://support.office.com/en-us/article/Can-I-add-custom-subdomains-or-multiple-domains-to-Office-365-5481401f-7771-490e-b728-b3a81305a32e