One of the most underrated uses of email is collecting reviews and then actually using them properly. Across multiple clients, this has been one of the simplest ways to add trust without changing the product or the offer.
It starts with post-purchase flows that ask for a review at the right time, followed by a reminder if someone doesn't respond. Once reviews come in, email becomes the showcase — five-star ratings, real customer names, specific product feedback in the customer's own words. Not marketing copy. Just real language from real customers.
Reviews aren't just for your product page. Email lets you turn them into social proof at scale — without feeling promotional.