User Guide - Adding Domain to O365
Prepared by:
Vodafone Shared Services Limited
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 Introduction
 You can add your own domain to O365 and set it as ‘by default’. This means that you want to
use the same email domain even after moving user’s mailbox to O365 (exchange online).
 Also for Lync (Skype for business) you can get your SIP domain added.
 (Note: Ideally SIP and Email domain are named under same Public Domain).
 Thus we can migrate the existing mailboxes, Lync users, without changing the Suffix for UPN.
 Or else you can add your own domain to create new users on o365 instead of migrating from
on-premise.
Example:
On-Premise Registered domain: ABC.com
O365 tenant Domain: abcltd.onmicrosoft.com.
[email protected] (on-premise email ID) Instead of using “[email protected]” , user can
still use “[email protected]” even after migrating Mailbox to O365,
 Steps for managing the Domain and Adding a domain to O365:


The first step you want to do is add an additional SMTP domain( your exisiting domain).
Navigate back to the Microsoft Online Portal, Login as Global Administrator
select Domains and click on +Add domain. The add domain wizard will show up which
consists of three step

Follow the below three steps

Enter the Domain name you Own and Hit NEXT

The wizard will show you a DNS record. As a proof of ownership you have to enter this TXT
record to your domain in public DNS.

When you have entered the TXT record to public DNS you can use the NSLOOKUP tool to
check if the TXT is available. Please note that it can take some time before the DNS records
are replicated

If so, go back to the Microsoft Online Portal and click Okay, I’ve added the record.

Click Next to continue to update user accounts with the new SMTP domain, if you don’t
want to do this right now click skip this step at the bottom of the page.( once selected and
continued then next time admin should login with <username>@inframn.nl instead of
<username>@<domain>.onmicrosoft.com
Here we are Skipping the step.
Click on “Skip this step”

You can also create new users accounts, but when you don’t want to at this point click
the skip this step at the bottom of the page. Here we don’t want to create any user, so we
will Skip this step.

The last step is to update your public DNS with the proper records.

Assuming you don’t want to transfer your DNS to Microsoft select the No, I have an existing
website or prefer to manage my own DNS records option and click Next to continue.
(usually in case of Migration {Hybrid deployment or Cutover and staged migration} we don’t
change the DNS records until migration is completed. If we are newly setting up the
infrastructure on cloud with creation of new users and mailboxes then make the necessary
DNS changes )

You can configure DNS for both Lync Online and Exchange Online. For eample we are
selecting only for Exchange

The wizard will now show all DNS records that are needed for Exchange Online, and you can
use these for inbound SMTP mail, for Outlook 2010 and above and for SPF (used for antispam):

When you’ve added these records to your public DNS (again, you have to take replication into
account) click on Okay, I’ve added the records to continue. When all is well you’ll see
a You’re all setup message and you’re done, click Finish.
(In case of staged migration cutover migration these records are unchanged till migration is
completed. In case of hybrid it depends how you want to route your mails.)
Reference Link:
 To add domain (watch video):
https://support.office.com/en-in/article/Set-up-Office-365-email-with-your-domain-5228338b339c-4b44-8800-f286f257345c