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The purpose of a send log is to document every send. This log serves as a comprehensive record of all email sends, including key details such as the recipient list, send time, and content of the email. By maintaining a meticulous log of each email sent, marketers can reference historical sending activity which aids in understanding the context and impact of previous campaigns.

This documentation is crucial for compliance and can also facilitate troubleshooting if issues arise with specific emails. In contrast, tracking email engagement rates is related to performance measurement rather than documenting sends. Storing historical email performance data focuses on the results of emails rather than the act of sending itself. Providing insights for future campaigns typically involves analyzing data, but again, that is more about leveraging the information rather than documenting the send process.