For some users, e-mails do not arrive without manually sending and receiving them. If you are having sync issues, you can force a disable faulty add-ins in Outlook 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

It includes a listing of your accounts, autocomplete information, and your name and initials. To repair your Outlook profile or create a new one, see Fix your Outlook email connection by repairing your profile. Go to your Outbox and then open the stuck email messages. If that message has an attachment that's larger than 20MB, delete the attachment and either attach a smaller file reset cached Exchange mode or attach a link to the attachment. For more information, go to Reduce attachment size to send large files with Outlook or Exchange Online limits.

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

If you've changed your password on the website for your email account, you'll need to change it in new Outlook, too. Sign up for tips and industry insights to level up your emailing skills. Outlook lets you block a sender or a domain in just a few clicks. This is a great way to protect your inbox from spammers and cyberbullies. If an email triggers the spam filters, Microsoft automatically moves it to your junk folder.

Create a new Profile

For more information, go to Reduce attachment size to send large files with Outlook. I deleted the Yahoo and Google accounts from Outlook and set it up again and that didn't fix anything. I uninstalled the New Outlook app and reinstalled it and that didn't fix anything. I am fairly sure it is something in my Microsoft account since all 4 of my Windows computers stopped working for the email at the same time. I have another Windows computer with a different Microsoft account and that is working fine.

Can't send mail in Outlook.com

• If you’re using cPanel, Outlook is most likely setup with POP3 account or IMAP.
• Find solutions to common problems or get help from a support agent.
• A status message appears at the bottom of the message list while Outlook is syncing.
• But if you’ve never cleaned your inbox, then you might have maxed out your storage limit.
• If you are having sync issues, you can force a manual sync by selecting the Sync button via the View tab on the Ribbon.

For more information, visit Add an email Repair Outlook Profile Online 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.