Hello, thank you for reaching out to Microsoft Q&A.
If you are able to send emails normally but are no longer receiving them, this could be due to email forwarding rules, or your emails might be moving to Junk, Spam, or another folder.
If you have checked all of your folders and new emails are still not being received, send a test email from another one of your accounts to the affected email address. Check whether you receive any bounce-back (non-delivery) error messages or if the email gets stuck in the Outbox.
If you receive an error, please share the complete error message here.
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 person or folder, such as Junk or Spam.
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.
Then, check your Blocked senders lists.