Hello, thank you for reaching out to Microsoft Q&A.
- Could you please confirm whether you’re able to send emails normally?
- What is the exact error message the sender receives when they try to send an email to your account?
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 folder, such as Junk or Spam.
Sign in with your Microsoft account on the link below to see if your incoming emails are forwarded to another 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)
To check blocked sender's lists, go to Settings > Mail > Junk Email > Blocked Sender's lists.
Additionally, ensure you have sufficient mailbox storage to send and receive emails.
Meanwhile, please enable these security protocols to prevent the same issue from happening in the near future.
1. Reset your Microsoft account password.
Open an InPrivate/Incognito browser window and use the following link to reset your password: https://account.live.com/ResetPassword.aspx
2. Sign out of your account from all sessions.
Once the password reset is successful, sign in with your account here: https://account.live.com/proofs/Manage
Scroll down until you find Sign out everywhere. Select Sign out everywhere.
3. Enable two-step verification.
On the Security settings page, under Additional security, turn on Two-step verification. Make sure you have at least three security verification methods active.