Opt In Lists

With the passage of the can Spam act I have to question whether it's worthwhile to even consider building a list that isn't double opt in.

 

However there is no denying that a single opt in list will get you a whole bunch of new subscribers faster and easier than double opt in. The numbers I hear are approximately 20 to 40% more subscribers.

 

I think that probably depends on whether you have a relationship with the subscriber or not.