Action: Change MX record to route your email to Office 365 Email systems use a DNS record called an MX record to figure out ...

Action: Change MX record to route your email to Office 365  Email systems use a DNS record called an MX record to figure out where to deliver emails. During the email migration process, your MX record pointed to your source email system. Now that the email migration to Office 365 is complete, it's time to point your MX record at Office 365. This helps ensure that email is delivered to your Office 365 mailboxes. Moving the MX record will also let you turn off your old email system when you are ready. It can take up to 72 hours for the email systems to recognize the changed MX record. Wait at least 72 hours before you proceed to the next task to stop email synchronization.