Hi Aar,
Sorry for the inconvenience caused,
please find the below link which will help you to resolve the issue
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/not-receiving-specific-email-address/d2d03fff-0d25-418f-aa81-d56d9aeb95bb
For more information you can click on the below link and reach out to our MSN technical support team.
https://support.microsoft.com/en-us/contactus/msn/explorer-tech-services/
Thanks
MSN Support Team