Hello, thank you for reaching out to Microsoft Q&A.
*Is the affected email address for a personal Microsoft account (e.g., ending in @outlook.com, @hotmail.com, or @gmail.com) that you created for services like Skype or Xbox, or for a work or school account provided by an organization (e.g., *****@company.com)?
- What is the exact error message the sender receives when they try to email your account?
- Did you check your Junk or SPAM folders to see if all incoming emails ended up there?
Send a test email from another one of your accounts to the affected email address. Check whether you receive any bounce-back error messages 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 folder, such as Junk or Spam.
Additionally, check that you have enough mailbox storage space available to send and receive emails by signing in with your account here
https://outlook.live.com/mail/0/options/accounts-category/storage
Let me know if you still need more help.