Open Relays and Proxy Servers
In our example of forging headers, we successfully spoofed our e-mail address
and some headers, but unfortunately this did not stop our IP address from being
identified within the e-mail. It clearly states our IP address on the line that reads
Received: from hostname (xx.7.239.24). If we were to send a bulk e-mail
like this trying to phish someone, we would be considered newbies and would
probably be an easy target for apprehension.
One way of hiding our IP address is to take advantage of open relay servers
combined with proxy servers. An open relay servers is an SMTP mail server that
allows unauthorized users to send e-mail ...