When you run into problems with email, these resources can help you solve email connection and delivery problems.
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First, check out these Outlook troubleshooters.
There you'll find top solutions to email issues, frequently asked questions answered by the Office team, the US support number, and a section where you can email us about your specific problem.
Look up help by error code
When Office 365 can't deliver email you sent, you'll receive an email notification called a non-delivery report. Find your error code for specific help with getting your email delivered:
Related Guides
- Basic mailbox settings for Outlook and other email clients (POP/IMAP)
- Diagnostics log collection in Support and Recovery Assistant
- Add an Outlook.com or Office 365 account
- How to Create Email Account in the Control Panel
- Groups naming policy
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We provide fully managed Microsoft 365 setup and support — so you can focus on running your business.
