Pretty Opt-In is a flexible WordPress Plugin make you can create the content locker for lead generation.
 

Main Features:

• Customize lockers elements and design styles, include different layout, header title, locker message, button text and etc
• Integrates with the mail services and plugins, include MailChimp, SendGrid, SendinBlue, MailPoet, ActiveCampaign, FreshMail, MailJet, MailerLite
• Choose locker subscription opt-in mode. Default mode is single opt-in
• Show locker on mobile devices and registered members or not
• Wrap content you want to lock via pretty-locker shortcode
• Use bulk actions to edit, publish, unpublish and delete lockers
• Save the emails of your subscribers on local wordpress database
• Choose the default sender name and sender email address for all of your outgoing emails.
• Set locker cookie expired duration
• Receive notifications via email when new lead received
• Set the link of Terms of Use & Privacy in your locker