Sending, receiving, and organizing email in Outlook.com
Hi there,
I’m Cherrelyn, and I’m here to help.
If you're receiving undeliverable message notices for emails you didn’t send, it's possible that your email address was spoofed or used by a spammer to send messages. These bounced replies are called backscatter. While it doesn’t necessarily mean your account was hacked.
Please try these suggestion:
- Change your password as a precaution.
- Check your Sent Items for any suspicious activity.
- Review your account’s activity history for unknown sign-ins.
- Set up two-step verification if you haven't already.
Unfortunately, you can't fully stop bounce messages, but these steps will help protect your account and ensure it's not being misused.
I hope this will help and if you have any question please don't hesitate to reply to this thread.
Warm regards,
Cherrelyn