Have you ever wondered how someone else can send email that looks like it came from you? This how-to guide describes it in excruciating detail. Not for the faint of heart, it’s a bare metal guide on how to do it. It’s not elaborate nor does it explain what the various commands do but it shows you how simple it is to send email, making it look like it’s coming from someone else.
Why am I passing this on? Because you should know how easy it is.