There are many reasons why you might not be receiving email from a specific sender, such as bank statements or password reset messages from a social network account. Unfortunately, Outlook.com can't fix this issue for you.
To resolve the issue, you will need to contact the sender and let them know that you aren't receiving email at your Outlook.com account. Please refer the sender to https://postmaster.live.com, where they can find information about best practices, recommended troubleshooting, and a link to contact our sender support team.
If your Outlook.com account isn't receiving email at all, see Fix Outlook.com email sync issues.