1. Go to the Office 365 Portal, https://portal.office.com
2. Go to “Domains” and click on “Add domain”
   
3. The wizard starts at step 1 “Verify your Domain”, press “lets get started”
4. Type your Domain and press Next
   
5. Now the wizard will provide a txt record to verify the ownership of the domain. This record must be added to the DNS registar of your domain.
   
6. At this point we can go back to the admin portal untill the txt record is added and applied. Just press the menu button, at top left, and click the “Admin” button.
   
7. When the txt record is ready, go to the domain section of the portal, select the domain and press “Start setup” 
   
8. click on “Okay, I’ve added the record” to verify the txt record and that all. After that the wizard will provide a list with all the DNS records that must be added in order to have the Office 365 fully functional. In case you are about to perform any kind of migration (cutover, staged, hybrid, imap) don’t change anything yet.
   

Note: this will also add the domain to the “accepted domains” of Exchange Online

Pantelis Apostolidis

Pantelis Apostolidis is a Sr. Specialist, Azure at Microsoft and a former Microsoft Azure MVP. For the last 20 years, Pantelis has been involved to major cloud projects in Greece and abroad, helping companies to adopt and deploy cloud technologies, driving business value. He is entitled to a lot of Microsoft Expert Certifications, demonstrating his proven experience in delivering high quality solutions. He is an author, blogger and he is acting as a spokesperson for conferences, workshops and webinars. He is also an active member of several communities as a moderator in azureheads.gr and autoexec.gr. Follow him on Twitter @papostolidis.

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