Developing an add-in that saves custom properties on an e-mail using the “saveAsync” method of the Office-js api: https://docs.microsoft.com/en-us/javascript/api/outlook/office.customproperties?view=outlook-js-preview#outlook-office-customproperties-saveasync-member.
You can view the properties if you create the e-mail, save the properties using the add-in and send it to yourself. However, if you send that same email to another user, that user is not able to pull the properties that were saved by me on the email while using EWS request to fetch the data. So, the question is, are custom properties only retrievable by the user who saved them?
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Solution
Custom Properties are not transmitted. This means that they are stripped from the outgoing email that eventually arrives in the Inbox of your recipients, including you.
However, these properties are available on the item in your Sent Items folder.
If you want to stamp persistent information on an item that will be available to recipients, consider using our Internet Headers API.
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