Hello, thank you for reaching out to Microsoft Q&A.
May I please know whether you are receiving all new incoming emails delayed, or if you have stopped receiving emails altogether?
Are you experiencing the same issue on Outlook.com in a web browser? Please sign in with your Microsoft account using the link below and check whether you can receive emails there.
If you are not receiving any new emails,, send a test email from another one of your accounts to the affected email address. Check whether you receive any bounce-back error messages. 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 folder, such as Junk or Spam.
And, also check if you have enough storage space to send or receive emails.
https://outlook.live.com/mail/0/options/accounts-category/storage