What’s Inside?
Learn what SMTP header injections are, how to perform them, and how to defend your applications against them.
Free ebook
This ebook provides an overview of SMTP Header Injections: what they are, how they work, and how they can be used to attack applications.
This introduction to SMTP Header Injections is an excerpt from our Injection Attacks: The Free 2020 Guide course.

Learn what SMTP header injections are, how to perform them, and how to defend your applications against them.