Anthony and Florian are explaining the different Opt-In and Opt-Out methods and cover the usage of Captchas.
This episode is referring to the following blog post:
http://inboxplacement.com/wp/beginners-guide-to-deliverability-lesson-6-single-opt-in-confirmed-opt-in-double-opt-in/
Starring: Anthony Mitchell, Florian Vierke
Edits: Florian Vierke