Office 365 Mail Flow Guided Troubleshooter
Several of the top Office 365 support issues that we see coming through support relate to mail flow. As we discussed in this previous post, there are a number of factors (on both the sending and receiving end) that could contribute to slow e-mail delivery, e-mails that are not received, e-mails that remain in the Outbox, etc.
Our support team has made it easy to allow Exchange Online and on-premises administrators diagnose mail flow issues for their users.
To start troubleshooting mail flow issues in Office 365, go to the Office 365 mail flow guided walkthrough: