Dear NevetsGuod
Welcome to the Microsoft Community!
I understand that you are not able to receive emails from one of your contacts, please point out if I am misunderstanding.
I need to know if your Outlook inbox can receive more emails? You can start by trying to add a new email to the https://outlook.live.com Add emails to your inbox, set the recipients to yourself.To make sure your Outlook mailbox can send and receive emails properly.
If you are able to receive emails, then your problem is probably that you are unable to receive emails from a specific domain. You can try the following actions:
1. The sender's email address or domain name may be blocked, add the sender's email address you want to receive emails from to your whitelist:
Click on the following link to be redirected to the web version of outlook https://outlook.live.com. Tap [Settings] in the upper right corner, find the [Mail] option in the tapped page, and find [Junk Email] inside. Find [Safe Senders and Domains] and click Add to add the sender's mailbox to the whitelist. At the bottom of the [Safe Mailing List] also add the sender's mailbox.
2. You can check your mailbox inbox rules:
Click on the following link to be redirected to the web version of outlook https://outlook.live.com. Tap [Settings] in the upper right corner. Select [Email] and click [Rules] to check if there are any settings in the rules that do not belong to you. If so, delete them.
This reply may not fully address your question, reply below to let me know about the progress of your question at any time.
I look forward to hearing from you!
I wish you all the best
Carmid.C-MSFT | Microsoft Community Support Specialist
