Robin Olisa:

I've tried a bunch of alterations to my Code but with no effect. The code itself does not return any errors but instead gives a success message. I am using gmail as my relay.

P.S, I commented out $mail->IsSMTP(); because I saw a similar question here that used it as a fix, I was getting an "smtp failed to connect" error.

I am using Phpmailer 6.0.

Here is my code:

  require_once('vendor/autoload.php');

  define('GUSER', '[email protected]'); // GMail username
  define('GPWD', '*********'); // GMail password

  function smtpmailer($to, $from, $from_name, $subject, $body) {
        global $error;
        $mail = new PHPMailer\PHPMailer\PHPMailer(true);  // create a new object
        //$mail->IsSMTP(); // enable SMTP
        $mail->SMTPDebug = 4;  // debugging: 1 = errors and messages, 2 = messages only
        $mail->SMTPAuth = true;  // authentication enabled
        $mail->SMTPSecure = 'tls'; // secure transfer enabled REQUIRED for GMail
        $mail->Host = 'smtp.gmail.com';
        $mail->Port = 465;
        $mail->Username = GUSER;
        $mail->Password = GPWD;
        $mail->SetFrom($from, $from_name);
        $mail->Subject = $subject;
        $mail->Body = $body;
        $mail->AddAddress($to);
        if(!$mail->Send()) {
                $error = 'Mail error: '.$mail->ErrorInfo;
                return false;
        } else {
                $error = 'Message sent!';
                return true;
        }
  }

  smtpmailer('[email protected]', '[email protected]', 'yourName', 'test mail message', 'Hello World!');
  if (smtpmailer('[email protected]', '[email protected]', 'yourName', 'test mail message', 'Hello World!')) {
        // do something
  }
  if (!empty($error)) echo $error;  

 ?>

If I uncomment $mail->IsSMTP(); I get this error log:

2017-12-27 07:58:54 Connection: opening to smtp.gmail.com:465, timeout=300, options=array() 2017-12-27 07:58:54 Connection failed. Error #2: stream_socket_client(): unable to connect to smtp.gmail.com:465 (Network is unreachable) [/srv/disk2/2564570/www/http://ift.tt/2zByAWS line 325] 2017-12-27 07:58:54 SMTP ERROR: Failed to connect to server: Network is unreachable (101) SMTP connect() failed. http://ift.tt/1IlANVr

Fatal error: Uncaught PHPMailer\PHPMailer\Exception: SMTP connect() failed. http://ift.tt/1IlANVr in /srv/disk2/2564570/www/http://ift.tt/2zByIWm Stack trace: #0 /srv/disk2/2564570/www/http://ift.tt/2BVNL3j: PHPMailer\PHPMailer\PHPMailer->smtpSend('Date: Wed, 27 D...', 'Hello World!\r\n') #1 /srv/disk2/2564570/www/http://ift.tt/2zBBYBn: PHPMailer\PHPMailer\PHPMailer->postSend() #2 /srv/disk2/2564570/www/http://ift.tt/2BWtyu7: PHPMailer\PHPMailer\PHPMailer->send() #3 /srv/disk2/2564570/www/http://ift.tt/2zCYg5O: smtpmailer('[email protected]', '[email protected]', 'yourName', 'test mail messa...', 'Hello World!') #4 {main} thrown in /srv/disk2/2564570/www/http://ift.tt/2BY0Usy on line 1726