Unable to send email using php mailer

Unable to send email using php mailer

Hello Zoho team, 
I am trying to configure email on my website but getting the following error:

2018-10-21 05:35:39 Connection: opening to smtp.zoho.com:587, timeout=300, options=array()
2018-10-21 05:35:40 Connection failed. Error #2: stream_socket_client(): unable to connect to smtp.zoho.com:587 (Connection refused) [/home/vikashjhakash/vikashtech.com/vendor/phpmailer/phpmailer/src/SMTP.php line 325]
2018-10-21 05:35:40 SMTP ERROR: Failed to connect to server: Connection refused (111)

I have used the following code.. please suggest me a solution for the same



<?php

use PHPMailer\PHPMailer\PHPMailer;
require 'vendor/autoload.php';
    $txt = "<html>
                <head>
                <title>M/s VIKASH TECH</title>
                </head>
                <body>
                Name - ".$_POST['name']."<br/>
Email - ".$_POST['email']."<br/>
Number - ".$_POST['number']."<br/>
Message - ".$_POST['message']."<br/>

               
                </body>
                </html>
                ";
    $mail = new PHPMailer;
    $mail->isSMTP();
    $mail->SMTPDebug = 4;
    $mail->Host = 'smtp.zoho.com';
    $mail->Port = 587;
    $mail->SMTPAuth = true;
    $mail->SMTPSecure = 'tls';
    $mail->Username = ' support@vikashtech.com';
    $mail->Password = '---mypassword---';
    $mail->setFrom(' support@vikashtech.com', 'M/s VIKASH TECH');
  
    $mail->addAddress(' support@vikashtech.com', 'M/s VIKASH TECH - Support Team');
    $mail->addAddress($_POST['email']);
    $mail->Subject = "Contact Request";
    //$mail->Body = $_SESSION['msg'].$_SESSION['otp'].$_SESSION['note'];
    $mail->msgHTML($txt, __DIR__);
   
    if (!$mail->send()) {
        echo 'Mailer Error: ' . $mail->ErrorInfo;
      
    } else {
        echo 'OK';
    }

    ?>
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