laravel 5.4 sendgrid not working in server

I'm trying to get SendGrid to send emails. It is currently working on my localhost but as soon as I put it on the my server I get an error (seen in the screenshot below).

Here is my configuration values.

.env

MAIL_DRIVER=smtp       
MAIL_HOST=smtp.sendgrid.net       
MAIL_PORT=587
MAIL_USERNAME=myusername       
MAIL_PASSWORD=mypassword      
MAIL_ENCRYPTION=tls

app/config/mail.php

    'driver' => env('MAIL_DRIVER', 'mail'),    
    'host' =>env('MAIL_HOST', 'smtp.mailgun.org'),
    'port' => env('MAIL_PORT', 587),       
    'from' => ['address' => env('MAIL_FROM_ADDRESS', 'hello@example.com'),
    'name' => env('MAIL_FROM_NAME', 'Example'),],   
    'encryption' => env('MAIL_ENCRYPTION', 'tls'),   
    'username' => env('MAIL_USERNAME'),
    'password' => env('MAIL_PASSWORD'),

Error

via Chebli Mohamed