How can we track emails sent between our users across our application?

We would like to track emails being sent / received across our application, how do we create a unique reference in an email?


  1. You can modify the headers of the message to include a unique identifier, i.e X-AppName-UniqueID = to add this to the headers you would need to send and read messages using RAW MIME.
  2. You can build a relationship database that maps emails across accounts, ensure you use the Header Message-ID's, not the Nylas messages ID's as these can change if the account is removed / added again.



How can we share emails across multiple accounts?


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