This document discusses tips for improving email deliverability. It notes that deliverability is important for marketing campaign success and has long-lasting effects. It identifies key factors like content filtering, subscriber engagement, and sender reputation. Content filtering involves avoiding non-pdf attachments, maintaining a high text-to-image ratio, and carefully crafting subject lines. Subscriber engagement is important as ISPs look at how subscribers interact with messages to determine inbox placement. Sender reputation, or trustworthiness, is also a factor and can be improved by avoiding shared lists, keeping data current, and mastering targeted messaging. Testing and feedback loops can help monitor and improve performance over time.