BACKSCATTER Protection

Backscatter is undesirable side effect of spam.

When a spam message is rejected by recipient's mail server,

A Non-Delivery Report (NDR), also known as bounce message,

is sent to a supposed sender, not an actual sender of the spam.

 (an email address which was forged as a sender of the original spam message)

ESET Mail Security

ESET Mail Security Backscatter protection writes X-Eset-NDR: <hash> into the header of each outgoing email message.

If the Eset-NDR: is not present or signature <hash> is incorrect, it proves to be a spam Backscatter and the NDR is rejected.