Sending, receiving, and organizing email in Outlook.com
I see, thank you. It seems like you will need to contact the Outlook support team to solve this.
In Outlook, click Help > Help.
Type your query something like "Not recieving emails from senders".
Click Yes beside Still need help, and sign in if needed.
You will be routed to an agent.
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I hope this information helps. If you have any more questions, don't hesitate to reach out. Wishing you good luck!