Hello, thank you for reaching out to Microsoft Q&A.
- Are you able to send emails normally?
- Could you please let me know the exact error message that the sender receives when they try to email your account?
Send a test email from another one of your own accounts to the affected email address. Check whether you receive any bounce-back error messages or if the email gets stuck in the Outbox. If you receive an error, please share the complete error message here. This will help us to determine the exact problem with your account.
If the email is sent successfully, then please check your email forwarding rules and blocked senders list, and verify whether the messages have been routed to another folder, such as Junk or Spam.
To check that, sign in with your account on the affected email address.
Email forwarding rules: https://outlook.live.com/mail/0/options/mail/forwarding
(Click Do not forward if your emails are being forwarded to another address)
Additionally, check that you have enough mailbox storage space available to send and receive emails.
Go to Outlook Settings > Accounts > Storage.
Let me know if you still need more help.