Azure Function which can be used to check if your mails are tracked by making use of the Microsoft Graph webhook functionality. Every time you receive an email, it will be passed to the Azure Function which checks the mail contents. If the mail contains a tracker, it will get the tracked category and also which tracker it found:

Important: currenlty this function code is created for single person use. If you want to run it for your whole application, you will have to do some code changes.

All you need to do for adding new trackers is add them in the trackers.json file:

{
    "name": "Tracker",
    "url": "part of the URL to check"
}

Note: If you have suggestions or other trackers, please create an issue.

If you want to make use of this Azure Function code, you will have to go through the following steps:

1. Create a new Azure AD application
   • Name: Email Tracker
   • URL: https://localhost:3000
2. Copy the Application ID and paste it into the config.json file (clientID).
3. In the Azure AD app, click keys and generate a new secret key. Once generated copy it, and paste it in the config.json file (clientSecret).
4. Go to the permissions section of the Azure AD app, and add Microsoft Graph API and give the app Mail.ReadWrite permissions.

1. Create a new JavaScript HTTP Triggered function, change the type to anonymous function.
2. Copy the URL of the function and add it to the config.json file (notificationUrl).

You will notice that you still have three properties which are required to fill in:

• subscriptionId
• user id (in the resource)
• clientState

subscriptionId

I choose to manually insert the ID after the subscription got created. As this is only running for one user, it only should maintain one subscription. If you want to support multiple, a better approach would be to use a database behind the scenes.

Best to first upload the code, create a new subscription and fill in this property.

User id

Specify the ID of the user or its UPN.

ClientState

You can choose what you want to fill in. This is an identifier for your webhook subscription. I choose to use: EmailTrackerFunction.

Once all the configuration is done, upload the code to your Azure Function.

Important: When you deployed the code via continuous deployment, you do not have to execute the next step.

Once uploaded, open Kudu from the function app settings page. Navigate to the function folder, and execute npm install. Which will install all the required packages.

Once everything is in place, you can create your new webhook subscription.

1. Go to: https://function-url?action=create
2. Once you got a response, go to your function in the Azure portal and click on monitor.
3. In the logs, you should now see two new request. Copy the subscription ID from the log output and paste it in the config.json file.

Note: you can also create your webhook subscription via the Microsoft Graph Explorer.

If you want to update the subscription, you should call the following URL: https://function-url?action=update

Info: in order to not let my subscription expire. I created a Timer triggered function which calls this endpoint every night.

If you want to delete the subscription, you should call the following URL: https://function-url?action=delete