mailtrap connection error laravel 5.3

I want to test send mail using laravel 5.3 I'm using mailable. But I'm getting this error: Connection could not be established with host mailtrap.io [Connection timed out #110]

My env config is:

MAIL_DRIVER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=465
MAIL_USERNAME=xxxxxxxxxxxxxx
MAIL_PASSWORD=xxxxxxxxxxxxxx
MAIL_ENCRYPTION=null

I also cleared cache using:

php artisan config:cache
php artisan cache:clear

But still not working.

via Chebli Mohamed