Troubleshoot email issues
When you run into problems with email, these resources can help you solve email connection and delivery problems in Office 365 .
First, check out Fix Outlook account problems in Office 365.
There you'll find top solutions to Office 365 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.
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:
Additional email help
Still need help? Contact support.
As an admin for Office 365 for business, you get free access to our knowledgeable support agents for pre-sales, account, and billing support, as well as for help resolving technical issues. You can also contact support on behalf of Office 365 users in your organization.
Note: If you’re using Office 365 operated by 21Vianet in China, please contact the 21Vianet support team.