Laravel Notifications: Mail (Mailgun) Response on NotificationSent event

I am using Mailgun as a mail driver in my laravel application, as well as nexmo for SMS purposes.

What I am trying to achieve is to maintain the delivery status of the notifications that are sent either via Mailgun or Nexmo. Incase of Nexmo I am able achieve this, since I get the nexmo MessageId in the NotificationSent event that is fired after processing a notification.

However in the event instance for email, the response is empty.

Any idea what I am missing or, how I can retrieve the mailgun message-id?

via Chebli Mohamed