Short answer: Check webmail first to find out whether the account or just one app is affected.
Try these steps
- Send a test message from a separate account and check Spam, Junk and other inbox tabs.
- Review mailbox storage, rules, forwarding and blocked senders.
- If webmail works but the app does not, check its connection and sync settings.
When to ask for help
For a business mailbox, ask the administrator to check service status and delivery logs rather than changing domain records yourself.
Learn more
Learn more: read this article — Troubleshoot Outlook.com email delivery. Menu names and available features can vary by device, software version and account type.
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