I am just looking for as many options as possible for a content locker that unlocks when a visitor enters their email. So far I have only found plugins that successfully support single opt-in, but it would be nice to have the double opt-in (confirmed opt-in) to ensure a real email is used to unlock the content.
These are the two that i have found:
WordPress - Opt-In Content Locker for WordPress | CodeCanyon
WordPress - Subscriber Content Lock for WordPress | CodeCanyon
The problem with either of these plugins is that a single wordpress update could wipe out their functionality so continual updates on them is crucial for long term usage.
Do any of you know of other email content lockers that supports either single or double opt-in email submits?
Take note that I am not talking about CPA ad network email submits. What I'm talking about would integrate with my aweber and the emails would be added to my own autoresponder.