We put together a video showing you how to prevent and stop email spammers from flooding your inbox with “Mail delivery failed: returning message to sender” emails from Mail Delivery System.

If your inbox is flooded with emails from Mail Delivery System like you see in the photo below, and if you did not attempt to send any of these emails, which is common when trying to send mass newsletters to email accounts that don’t exist, then you are most likely a victim of email “spoofing.”

Mail delivery system email spam

How to stop the error “mail delivery failed: returning message to sender” – Video

Is My Email Hacked?

The good news is that in most situations where Mail Delivery System emails are flooding inboxes,  the email account in question is usually not hacked. The spoofing attack is done externally and there is a fairly easy way to stop it. Simply watch our video above.

Question? Comments…

If you have any question or are still experiencing issues with Mail Delivery System Emails, comment below and we will gladly try to help!

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Cyber Security, Email, Spam Prevention


  1. David Zuric on March 4, 2018 at 6:56 pm


    It is happening to me but I use Apple mac books. Can you please advise ho to do the same on Mac?

    • admin on April 7, 2018 at 1:52 pm

      Hi David, this solution will solve the problem on Mac or Windows. The problem is with your email host so you need to do as we specified above and this should fix your problem. If you are still having issues, I would advise you contact your host and they should be able to diagnose the problem. Thank you for your comment.

  2. John E Micheal on June 20, 2018 at 6:39 am

    This is surely a topic that is overlooked. Kudos to the author for enlightening us with such a topic, great content!

  3. Larry on August 27, 2019 at 1:00 pm

    I can’t find the control panel to stop the spoofing.

    • Wisevu on December 13, 2019 at 12:16 am

      You can contact your hosting server to get access to your control panel. It is usually located at http://www.yourdomain.com/cpanel
      Hope that helps

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