Email Metadata for later tracking

We’ve released a quick update today which allows you to “identify” easily every email sent.
For this we have a new email header: X-NZ-Metadata.

All data sent in this email header will be saved to the database and later on can be retrieved by API call: send.info.

Also the value of the X-NZ-Metadata header will be sent with all webhook calls in the meta array.

Here is a quick example of adding custom email header X-NZ-Metadata with Swift mailer:

$message->getHeaders()
        ->addTextHeader("X-NZ-Metadata", "My custom string: ID or JSON, etc.");