The non-delivery report (NDR) is generated when an email message is not able to be sent to the next hop.
Spammers can use NDR as a method to generate spam towards victims by using the victim's email address as the sender. This is called a reverse NDR Attack.
Consider the following scenario:
From: Bob@Victim.com To: invalid@yourDomain.com
|Created on:||May 18, 2016|
|Last updated on:||Nov 30, 2023|
I want to congratulate with your Team!
This Reversible NDR Attack picture is perfect to explain this Threat.
Hello, it was a pleasure reading your article. Your article has helped me a lot. My mail service received a lot of rcpt attacks yesterday, have you encountered a similar situation, is there a good solution, looking forward to your reply