Sending, receiving, and organizing email in Outlook.com
Hello, thank you for reaching out to Microsoft Q&A.
What is the exact error message the sender receives when they try to email to your address?
You can try sending a test email from another account of yours to the problematic email address. If you receive any bounce back error message, share the error message with us here.
Meanwhile, ensure you have enough storage space to send or receive emails -
https://outlook.live.com/mail/0/options/accounts-category/storage
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If the storage isn't full, check your Junk or SPAM email folders and see if the emails ends up there.
And, check your email forwarding rules to verify that your emails are not being forwarded to another email address.
Let me know if you still need more help