April 28, 2026
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In the Email Performance API, the Stream events endpoint now provides more detailed event data for email tracking. The
eventTypefield has been extended with a neweventSubTypefield, offering more granular insights into bounce reaasons. For example, you can identify specific reasons such as a non-existent recipient address, a full mailbox, or a suppressed address, helping you better understand and act on delivery failures.Additionally, the
eventReadTimefield indicates how long recipients spent reading an email, in seconds, enabling deeper analysis of engagement.