What engagement metrics measure
Engagement metrics report how recipients interact with your mail. They cover two tracked actions:open: the number of times the email was opened.click: the number of clicks on tracked links in HTML messages.
open_tracking_delivered: the number of recipients of delivered HTML messages where open tracking was enabled in the send request.click_tracking_delivered: the number of recipients of delivered HTML messages containing tracked links, where click tracking was enabled in the send request.
Example query
The example below requests daily engagement totals for a single campaign in January 2026.Open and click tracking is not available in our free tier.

