<https://forums.hak5.org/topic/26861-sendmail-open-relay/#comment-205312>
<http://schema.org/text>
"Thanks for keeping the thought train running, there is so many possibilities to this configuration, the hak5 team keeps pumping new things every week on the videos making me switch from a network admin to a security expert :)  \nI will be waiting for what you might think of later! "
<https://forums.hak5.org/topic/26861-sendmail-open-relay/>