Here are Plugins & Snippets collection of downloads related to Email Marketing. Please have a look if there's any download that could be of help to improve and enhance your Easy Digital Downloads WordPress webstores.
One goal of your marketing strategy should be to build up an email marketing list. An email marketing list can become a very effective tool for communicating with your audience and incentivize them to come back to revisit your website.

Source: How to Build a Digital Product Marketplace in WordPress - Plugins & Snippets