Error 400 message : At least FromEmail or Sender must be provided

[soytouch]

Facing an issue when sending email.. Everything is defined well in the body but

... 

$body = [
    'Messages' => [
        [
            'From' => [
                'Email' => getenv('SMTP_FROM_EMAIL'),
                'Name' => "Me"
            ],
            'To' => [
                [
                    'Email' => "example@gmail.com",
                    'Name' =>  "User fullname" 
                ]
            ],
            'Subject' => "Subject",
            'HTMLPart' => $message
        ]
    ]
];

$mailjet->post(Resources::$Email, ['body' => $body]);