This document provides an overview of email deliverability, including trends and tips to improve deliverability. It discusses how deliverability refers to an email's ability to be delivered instead of blocked by spam filters. Poor deliverability can result from undeliverable addresses or spam filters. Tips to improve deliverability include being recognizable, setting expectations, keeping content relevant and valuable, including opt-out links, and monitoring reports to remove invalid addresses. Authentication standards like SPF and DKM help prove the sender's identity. Subscriber engagement through opens and clicks also impacts deliverability.