While your website may be the central piece of a free trial subscription marketing campaign (think banners, content behind barriers, registration forms, etc.) email also plays an integral role. That's because getting a prospect to sign up for a free trial isn't enough -- you have to convince users during that trial period to become paying customers.
Email is a perfect channel for conversion efforts, whether overt, such as discount offers to upgrade to a paid membership, or subtle, such as informational emails that encourage users to interact with your site and become hooked on the service.
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