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Level 2

Hi @felixsongfei 


In addition to what Adhiyan has explained about the message ID creation, if you want to see the message ID for an email that was sent out - it can be seen from the tracking server logs
Alternatively, if you click on any URL in the mirror page you would see the 3 IDs in the URL before the redirection happens, the first ID is the message ID. As in the below screenshot.

Message ID.png