Laravel 5.6, email not not sending on server with sendmail driver

I am using laravel 5.6 and i can send email on locale but not on server with sendmail driver.

MAIL_DRIVER=sendmail
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=
MAIL_PASSWORD=
MAIL_ENCRYPTION=null

via Chebli Mohamed