Connection could not be established with host smtp.sendgrid.net :stream_socket_client(): unable to connect to tcp://smtp.sendgrid.net:465

I am trying to send mail using sendgrid in Laravel but it is working on localserver but as i hosted it on server it is giving me following error message:

my mail settings in .env file:

MAIL_DRIVER=smtp
MAIL_HOST=smtp.sendgrid.net
MAIL_PORT=587
MAIL_USERNAME=myusername
MAIL_PASSWORD=XXX
MAIL_ENCRYPTION=tls
MAIL_FROM_ADDRESS=info@xyz.com
MAIL_FROM_NAME=xyz

via Chebli Mohamed