Sending, receiving, and organizing email in Outlook.com
This behavior is consistent with a compromised Outlook.com account. After changing the password, check for leftover mailbox changes that attackers commonly add.
- Run a full malware scan on the PC first.
- Open Windows Security.
- Go to Virus and threat protection.
- Select Scan options > Full scan > Scan now.
- This should be done before changing account settings again.
- Use the Microsoft account sign-in helper to secure and recover the account.
- Start here: Sign-in Helper
- If the tool cannot resolve the issue, use the sign-in recovery flow in When you can't sign in to your Microsoft account from the account unblock guidance.
- Check Outlook.com mailbox settings for attacker changes.
- Review Rules and remove anything not created intentionally.
- Review Forwarding and remove any unknown forwarding addresses.
- Review connected accounts and automatic replies.
- Attackers often create rules that move or forward mail, which can also affect delivery behavior.
- Check for signs of compromise in the mailbox.
- Look for suspicious messages in Sent Items and Deleted Items.
- Look for missing or deleted mail and suspicious inbox rules or forwarding.
- These are common symptoms of a compromised email account.
- Change the password again after the malware scan if needed, and make sure it is strong.
- If sign-in works, change it from the Microsoft account security page.
- If sign-in does not work, use the password reset flow.
- If mail is still being rejected after cleaning rules and forwarding, use the recovery/support path offered by the sign-in helper, which can provide self-help steps or the option to talk to an agent.
Important: if deleted messages were permanently removed from the mailbox, Microsoft does not keep backups of personal mailboxes, so those messages might not be recoverable.