Question about conversation ID , initial emails message id gets changed when someone responds to the email

Question

So, we are sending emails to leads that filled out forms on our website. I track the message id of each template I send to our leads. If someone responds to one of those templates its starts the conversation which i need to reply to. I have a script that looks for new replies, it could find the reply fine, but i pull the message id of all emails in the chain (initial and the response) and the initial emails message id is now different then the message id I had when I sent the email. Why does the message id change when a conversation is started. This makes my tracking impossible. Any way around this?

Answer 1

Hi @intake

Have you tried using immutable IDs? Add it to the request header to ensure your application can retrieve IDs that do not change during the item's lifecycle.

https://learn.microsoft.com/en-us/graph/outlook-immutable-id.

Hope this helps.

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