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Here’s provide some reasons to ‘Not Receiving Emails in Outlook’, you need to look at once.

1. Your internet connection is not proper working
2. The other reason behind the outlook email not receiving any mails is might be any settings in the PC you use, may block the mails.
3. You have not refreshed your mailbox or maybe the mails have been sent to the spam folder
4. The reasons not able to receive email but can send the, is your mail not be synced
5. Maybe you enter the wrong email id
6. The web server itself starts working after sometimes
7. Many times, our PC is being detected with a virus or malware

I hope after check these reasons or causes, your issue is easily solved the Not Receiving Emails in the Outlook issue. 

Also, To learn more details: How to Fix Cannot Send email from Outlook