Used to work in a fortune 500 company that would send email notifications to customers telling them their monthly statements were available. Unfortunately, the

Used to work in a fortune 500 company that would send email notifications to customers telling them their monthly statements were available. Unfortunately, the monkeys who coded the email sending didn't understand the protocol, obviously had not read the RFC. The code would blindly send smtp commands without waiting for a response. One day the smtp server decided to change its behavior due to a dns misconfiguration and many emails were lost.