We are currently experiencing a delay on Event API delivery. Should you be using this feature, it means that some events may arrive with a delay of up to a few hours.
Our technical team is already hard at work to resolve this issue. Rest assured that no event has been lost, just delayed.
We will update you here as soon as we have more information. If you have any urgent questions we are here to help.
You can contact our Customer Support team here: https://www.mailjet.com/support/ticket/