This issue of "Happy Sending" from Postmark explores various topics including data quality, marketing automation, and transactional email. The newsletter highlights the significance of credibility in transmitting knowledge, as well as its relation to the Modern Data Stack. It also discusses how businesses scale and impact data teams with increasing complexity, which erodes data quality and trust. Additionally, the newsletter provides a tactical guide on using dbt snapshots to track trends over time and features insights from Postmark's customer, Kay Peacey, who shares her experience with marketing automation tools like ActiveCampaign. The issue also covers recent product updates, including the Retention Add-on, which allows users to adjust retention periods between 7 and 365 days. Furthermore, it highlights new features in the WordPress plugin and CX App for ActiveCampaign, such as metadata support and content personalization. Finally, the newsletter showcases a behind-the-scenes look at Postmark's authentication video series using kittens, puppies, and ducklings to explain SPF, DKIM, and DMARC standards.