Email is no longer just a newsletter—it’s one of the highest-converting tools in e-commerce when done right. In this guide, we break down 5 data-backed strategies D2C brands are using in 2025 to drive serious revenue: automated flows that work in the background, hyper-targeted segmentation, interactive content that increases engagement, AI that writes and sends smarter, and omnichannel layering with SMS and push. These aren’t trends—they’re revenue engines.