With a few steps and integrations, you can start using your Messenger bot to build out your email list. This article shows you how to set up this process using the Pro version of ManyChat (starting at $10 per month) and the email marketing service of your choice.
To get started, log into your email marketing service. Next, you’ll need to create a list to which you’ll add subscribers from your Messenger bot and set up any automated messages you want to send when users are added to your list.
Source : Social Media Examiner