This incident has been resolved.

A fix has been implemented on Event API feature, the service is now stable and real time. We are still monitoring the service, if you have any question about that issue, please contact our support team.

You may experience, as an Event API user, a delay in receiving events to their endpoints. Our engineers are investigating. We understand that this is critical and are working to solve this as soon as possible. We will provide continuous update here.
Should you have any concerns or questions, we’re here to help. You can contact our support team at https://www.mailjet.com/support/ticket/