SMTP Error

Swift_Transport_StreamBuffer->{closure}(2, 'stream_socket_client(): unable to connect to tcp://smtp.sendgrid.net:587 (Connection refused)', '/home/virtuest/finance.virtuestech.com/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php', 264, array('host' => 'tcp://smtp.sendgrid.net', 'timeout' => 30, 'options' => array(), 'streamContext' => resource, 'errno' => 111, 'errstr' => 'Connection refused'))

It means that your SMTP details are not correct.