I've registered an account at Mailjet service, got my API keys and trying to send a few test emails from my development server using library https://github.com/mailjet/mailjet-apiv3-php.
I always get 401 Unauthorized answer, and in my account at mailjet.com there is a message:
"Your sending activity is currently suspended. Please contact our Support Team for more information."
Cannot get any reasonable answer from their support, only standard bot messages. Can anyone help me with this?