Repair Outlook or your profile
Finally, Microsoft offers some tools that can potentially repair Outlook if certain aspects of the program get corrupted. If you still can't receive email, it might be time to try to repair Outlook. This is a time-consuming process (it can take an hour) so save this for a last resort.
Click Start and then choose Settings. In the Settings app's search box, type "apps" and then choose Add or Remove programs when it appears in the search results. Scroll down the app list and find Microsoft Office (depending on your version of Office, it might be labeled differently, like Microsoft 365). Click the three-dot menu to the right and choose Modify. Choose Online Repair and then click Repair.
If this doesn't fix the problem, you can also try to repair your email account profile. In Outlook, choose File, then Account Settings and then choose Account Settings again from the drop-down menu. In the Accounts Settings dialog box, click the email account that won't send mail and click Repair.
You can try to repair your email account — it's time-consuming, but might solve a problem with a corrupted file.
