Message resource extensions - Can be reviewed within the email itself?

Copper Contributor

I'm using Graph SDK in order to edit some Message resource properties. 


I'm adding an Extension using POST /users/{id}/messages/{id}/extensions endpoint.


How can I view the Extensions I added from within the email itself? (not by Graph SDK or Graph Explorer. The actual mail).


If it's not possible, storing the data on singleValueExtendedProperties / multiValueExtendedProperties will be reflected in the email itself?



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