Getting email to work with your domain in Office 365 can be challenging. There are DNS records to set up, you have to work with several websites, and the DNS system is slow and nitpicky.
Because there are a lot of different areas involved in making sure email can be sent and received, try using the Outlook Connectivity Guided Walkthrough to track down why email isn’t working in your scenario.
If the troubleshooting steps in the walkthrough don’t help in your situation, post a question in the Office 365 community forums. They’re a great resource, including Microsoft support agents who can help if you’ve tried the guided walkthrough and are still stuck.
Note Just getting started with Office 365? Learn about setting up and managing domains for Office 365 Small Business or Office 365 Enterprise and Office 365 Midsize Business.