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I just started using this platform. I have a gmail account. I started testing the outlook email using the default configurations. I sent a test email to my gmail account. the email was received by gmail. I replied back from gmail. The email was never received by outlook.
This is probably just a configuration issue but, I don't know enough about Exchange to make it work right. This needs to work right the first time!
Does this testing mailbox's mail address use onmicrosoft.com domain? If not, you need to update the MX record at your domain name registrar (or DNS hosting provider) to point it to Microsoft Online. Follow the following steps to configure your domain.