How to send mail using phpmailer - php

Question

I'm having trouble to send mail using phpmailer. Error appear is,
2016-02-16 13:20:14 Connection: opening to 103.8.25.18:465,
timeout=300, options=array ( 'ssl' => array ( 'verify_peer' => false,
'verify_peer_name' => false, 'allow_self_signed' => true, ), )
2016-02-16 13:20:35 SMTP ERROR: Failed to connect to server: A
connection attempt failed because the connected party did not properly
respond after a period of time, or established connection failed
because connected host has failed to respond. (10060) 2016-02-16
13:20:35 SMTP connect() failed.
https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting Message
could not be sent.Mailer Error: SMTP connect() failed.
https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
If I test using direct from my localhost PC, it can send the mail but when I transfer the system to our office server, it won't send the mail. Below are the phpmailer codes;
require '../PHPMailer/PHPMailerAutoload.php';
$mail = new PHPMailer;
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'mail.mydomain.com'; // Specify main and backup SMTP servers
$mail->SMTPDebug = 2;
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'myusername'; // SMTP username
$mail->Password = 'password'; // SMTP password
$mail->SMTPSecure = 'tls'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 587; // TCP port to connect to
$mail->AddAddress('kamran#ktmparking.com.my');
$mail->addReplyTo('info#ktmparking.com.my', 'HR-KTMBCP');
$mail->setFrom('info#ktmparking.com.my', 'HR-KTMBCP');
$mail->SMTPOptions = array(
'ssl' => array(
'verify_peer' => false,
'verify_peer_name' => false,
'allow_self_signed' => true
)
);
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = 'Leave Application';
$mail->Body = 'example of message ';
$mail->AltBody = 'example of message';
if(!$mail->send()) {
echo 'Message could not be sent.';
echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
echo 'Message sent';
}