I did a search on this forum and tried several of the suggestions but non appeared to work. Some email providers (such as your ISP or even Gmail) won't let you send messages larger than a certain size. Adding pictures and large attachments to your message can prevent you from sending that message (and any messages sent Exchange connectivity diagnostic after the large message). If you’re using cPanel, Outlook is most likely setup with POP3 account or IMAP. I’ve seen some providers have issues when auto Send/Receive is set to less than 5mins. Outlook accounts can have up to 100GB of storage per mailbox.

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 Fix Outlook Not Opening After Windows Update more information.

Make sure you are connected to the Internet

But every once in a while, the Microsoft filters get it wrong and accidentally label a normal email as spam. To start Outlook in safe mode, press the Windows key on your keyboard. In the search box, type outlook.exe /safe, then press Enter.

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

• Articles, examples, tutorials, and inspiration from our emailing experts.
• For more information on creating a new email profile, see Create an Outlook profile.
• I have another Windows computer with a different Microsoft account and that is working fine.

For more information, visit Add an email Outlook data file cannot be accessed 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.