In Outlook, sometimes your outgoing messages get stuck in your outbox and just won't send. Learn about some ways to get them moving.

Check to see if the new Outlook toggle is turned on or off. If it's on, please go to Troubleshooting Outlook issues. As a first step, go to the Classic Outlook troubleshooters page and select one …

Learn how to fix Outlook.com email sync issues if you can't receive or send messages.

Follow these steps to let Outlook diagnose and fix errors in your Outlook mail profile that might be causing the issue. In Outlook, choose File. Choose Account Settings > Account Settings. On …

In Outlook, sometimes your outgoing messages get stuck in your outbox and just won't send. Learn about some ways to get them moving.

If you are having problems with Outlook, there are a few things we can help with to get you back to sending and receiving your email. Select a tab option below for the version of Outlook …

Nov 3, 2025 · When you send or reply to an email you get a non-delivery report (NDR) error message. The issue may happen more consistently if the Outlook.com account is in an …

When this problem occurs, the message remains in your Outbox folder until you manually initiate a Send/Receive operation (for example, press F9 or select send or receive).

When you send an email and receive a delivery failure message, there could be several reasons. We've listed the most common error messages below, along with suggested resolutions.

Did you get an Outlook not responding error? Is Outlook stuck on a screen that simply says "Processing"? Or does Outlook freeze or stop working when you're opening a file or sending …

When you're away from home and send an email message using your home email account, your email message might be returned with a 550, 553, or relay-prohibited error message.