Which email report should be pulled to gather metrics such as delivery rate and open rate for business units?

The Campaign Email Tracking Report is the appropriate choice for gathering key metrics like delivery rates and open rates for business units. This report is specifically designed to provide insights into how well email campaigns perform in terms of their reach and engagement metrics. It tracks essential aspects such as the total number of emails sent, delivered, opened, and clicked, allowing businesses to evaluate the effectiveness of their email campaigns and make informed decisions to optimize future messaging strategies.

The other reports serve different purposes. The Account Send Summary Report generally offers a high-level view of all sends from an account, which may not include detailed engagement metrics like delivery and open rates. The Email Send Report tends to focus on metrics related to specific sends without the comprehensive analysis of engagement metrics. Lastly, the Email Performance Over Time Report provides a broader trend analysis over a specified timeframe but may not focus on the immediate metrics required for evaluating individual campaign effectiveness. Thus, the Campaign Email Tracking Report is the most suitable choice for obtaining the specific metrics in question.