This document provides 50 tips for building an email marketing list organized into 6 sections: social media, web/website, email campaigns, offline, mobile/SMS, and email strategy. Some key tips include asking for email subscriptions on social media platforms, including opt-in forms on your website, leveraging transactional emails to ask customers to subscribe, and collecting email addresses at offline events. An overarching theme emphasized is setting clear privacy policies and expectations for subscribers and honoring those commitments to build trust over the long term. The document aims to give varied ideas and tactics for growing engaged email lists without resorting to buying or renting lists.