Email event triggers now include a unique Message ID. You can add this value to your Send Webhook payload so each open or click can be tied back to the exact email that generated it.

What changed

The Email Events trigger now provides a stable Message ID for the email that was opened or clicked.

How to use it

1. In a workflow that starts with the Email Events trigger, open your Send Webhook action.
2. When building the webhook body, select Message ID from the custom value picker.

The same email will always produce the same Message ID, even if the contact opens it multiple times. Different emails produce different Message IDs.

Why it matters

This makes it easier to deduplicate repeat opens and clicks and to report engagement accurately in external systems.

Example

If you send two campaign emails in the same week and push open/click events to a reporting dashboard, the Message ID lets you record engagement against the correct email every time.

Notes

• Applies to both Email Opened and Email Clicked when using the Email Events trigger.
• The Message ID remains stable for repeat opens of the same message.