We need to disable the NDR mesages to sent back to sender if the e-mail address does not exists in environment.
We need to disable the NDR message sent back to sender , if the recipient address does not exist.
E.g: If firstname.lastname@example.org sends an e-mails to email@example.com recipient, and firstname.lastname@example.org is not a correct address or recipient has left the organization and e-mail address is not present. Our we do not want the NDR message sent to sender.
Most of time spam tries to send mails and NDR helps them to know about the recipient status.