Sendmail Tutorial (version 2.4) – find out why Sendmail is called ‘the buggiest daemon on earth’. Tons of ways to crack into big computers as well as PCs unleashed, including, of course, information on how to block these holes.
You can download it from the following link: https://packetstormsecurity.com/files/download/15974/sendmail.txt
Source: https://packetstormsecurity.com/files/15974/sendmail.txt.html