Laravel email sending not working on server – CPanel

I have a domain, and I created an email with the Cpanel on that server. Now when I try to use it, I get the following error.

Connection could not be established with host [email protected]
:stream_socket_client(): php_network_getaddresses: getaddrinfo failed:
Name or service not known

.env

MAIL_MAILER=smtp
[email protected]
MAIL_PORT=465
[email protected]
MAIL_PASSWORD={mypassword}
MAIL_ENCRYPTION=ssl
[email protected]
MAIL_FROM_NAME="${APP_NAME}"