Hi All,
A customer of mine has Exchange Mail Security 6.4 installed and integrated with Exchange 2010.
Spammers keep sending emails to addresses that do not exist in the Exchange environment...this is causing the Exchange server to send NDR's back. From what I understand, this is considered a reverse NDR attack.
How can I configure Exchange Mail security to just drop emails that are going to addresses that do not exist in Exchange?
I understand within the Exchange Management Console, there is a way of filtering recipients and blocking emails going to addresses that do not exist in the directory. Is there a way of setting this up within ESET Mail Security?