SMTP Mail not sending - Codeigniter Email Library

I'm having issues in sending mail through SMTP Protocol. 

**Welcome.php**

PHP Code:

$this->load->library('email');

$config = array();
$config['protocol'] = 'smtp';
$config['smtp_host'] = 'smtp.zoho.com';
$config['smtp_user'] = '[email protected]';
$config['smtp_pass'] = '**************';
$config['smtp_port'] = 465;
$config["smtp_crypto"] = "ssl";

$this->email->initialize($config);

$this->email->set_newline("\r\n");
$this->email->from('[email protected]', 'Support name'); // change it to yours
$this->email->to($to);// change it to yours
$this->email->subject($subject);
$this->email->message($message);

if($this->email->send())
{
  echo "Success! - An email has been sent to ".$to;
}
else
{ 
  show_error($this->email->print_debugger());
  return false;
}
} 


Here is the output error:    

Code:

An Error Was Encountered
    220 mx.zohomail.com SMTP Server ready June 29, 2018 5:16:40 AM PDT 
        
    hello: 
    
    The following SMTP error was encountered: 
    Unable to send email using PHP SMTP. Your server might not be configured to send mail using this method.
    Date: Fri, 29 Jun 2018 12:16:40 +0000
    From: "Support Name" <[email protected]>
    Return-Path: <[email protected]>
    To: [email protected]
    Subject: =?ISO-8859-1?Q?=43=6F=70=79=20=61=6C=6C=20=74=68=65?=
    Reply-To: <[email protected]>
    User-Agent: CodeIgniter
    X-Sender: [email protected]
    X-Mailer: CodeIgniter
    X-Priority: 3 (Normal)
    Message-ID: <[email protected]>
    Mime-Version: 1.0
    
    
    Content-Type: multipart/alternative; boundary="B_ALT_5b3623284061c"
    
    This is a multi-part message in MIME format.
    Your email application may not support this format.
    
    --B_ALT_5b3623284061c
    Content-Type: text/plain; charset=ISO-8859-1
    Content-Transfer-Encoding: 8bit
    
    Some
    
    
    --B_ALT_5b3623284061c
    Content-Type: text/html; charset=ISO-8859-1
    Content-Transfer-Encoding: quoted-printable
    
    Some Email Description=0A=0A Some Email Description
    
    --B_ALT_5b3623284061c--

Note: The script is working fine on localhost, as well as multiple other hostings but not working on VPS Hosting.

These are the things to remember:

 1. The code is fine (Tried in different hosting and it works)
 2. Changing $config['protocol'] = "smtp"; to $config['protocol'] = "sendmail"; it works. But I want to send mail only through SMTP Protocol. 
 3. Using Zoho Mail SMTP Protocols (smtp.zoho.com)
 4. Tried, Google SMTP, Still not sending. (Used PHPMailer Library to test with the credentials. It's working on them.)

Attached Files

Thumbnail(s)