Resources

People often ask me "How did you learn how to hack?" The answer: by reading. This page is a collection of the blog posts and other articles that I have accumulated over the years of my journey. Enjoy!

Communicate to SMTP Server with Telnet- 340

Carrie Roberts - Black Hills InfosecPosted 5 Years Ago
  • Remember spam? No, I mean the spam of the 80's and 90's! The email spam was HORRIBLE because email servers would send off whatever you gave it with no authentication or valid information the domains.
  • Although the any domain part is mostly gone, you can still find SMTP servers that will relay whatever email with a sender domain that it knows.
  • This can be used for spoofing emails for internal network pentests to launch phishing campaigns.
  • This article shows the commands for actually talking to the server over telnet and sending off emails. SMTP is a newline based protocol (super simple) but the syntax is a little tedious to work with.