For some users, e-mails do not arrive without manually sending and receiving them. If you are having sync issues, you can force a Office 365 Sync Errors Fix manual sync by selecting the Sync button via the View tab on the Ribbon. A status message appears at the bottom of the message list while Outlook is syncing.

Repair your classic Outlook program

And in most cases, that’s where it belongs. For more information on creating a new email profile, see Create an Outlook profile. Please go to Reset a forgotten Microsoft account password for solve Office 365 mailbox sync delays more information.

Make sure you are connected to the Internet

For more information, please go to Sync to manually check for new mail and to send messages in Outlook. Sometimes, an Outlook add-in will crash and prevent your email messages from sending. To disable all add-ins, you can start Outlook in safe mode. If you can send email while Outlook is in safe mode, creating a new Outlook email profile should allow you to send email again.

Check your blocked users list

Articles, examples, tutorials, and inspiration from our emailing experts. Create your account and connect with a world of communities. Find solutions to common problems or get help from a support agent. Occasionally, the Outlook program may need to be repaired. Repairing is a simple process but may take as long as half an hour to complete. For more information, see Repair an Office application.

Create a new Profile

But if you’ve never cleaned your inbox, then you might have maxed out your storage limit. So if you’re waiting for an email from someone, you may want to check if the sender is registered on your blocked users list. But still, it’s worth checking if other users are currently experiencing similar issues with Outlook. Microsoft comes with a great option called Work Offline.

Can't send mail in Outlook.com

• But still, it’s worth checking if other users are currently experiencing similar issues with Outlook.
• Occasionally, the Outlook program may need to be repaired.
• We've presented the methods in order of quickest to most in-depth.
• For more information, visit Add an email account to Outlook for Windows.
• For more information, go to Reduce attachment size to send large files with Outlook.
• To repair your Outlook profile or create a new one, see Fix your Outlook email connection by repairing your profile.

For more information, visit Add an email resolve Outlook not sending emails fast account to Outlook for Windows. If that doesn't fix the problem, see the next section. To get help and troubleshoot other Microsoft products and services, enter your problem here.