PHP Mailer Function not working - php

Question

I am new to PHP and have a form that sends mails. The following is the PHP code and i get the message
"Message body empty message could not be sent.
mailer error:
"
I have been searching on google whole day of what the issue might be but have not been able to figure it out.
I am not understanding the part "Message body empty". I checked the $mail.body and it has the value.
<?php
require_once("class.PHPMailer.php");
$mail = new phpmailer();
$mail->issmtp(); // set mailer to use smtp
$mail->host = "smtp.office365.com"; // specify main and backup server
$mail->smtpauth = true; // turn on smtp authentication
$mail->username = "noreply#test.com"; // smtp username
$mail->password = "test123"; // smtp password
$mail->from = "noreply#test.com";
$mail->fromname = "no reply";
$mail->addaddress("johndoe#test.com", "John Doe");
$mail->wordwrap = 50; // set word wrap to 50 characters
//$mail->addattachment("/var/tmp/file.tar.gz"); // add attachments
//$mail->addattachment("/tmp/image.jpg", "new.jpg"); // optional name
$mail->ishtml(true); // set email format to html
$mail->subject = "here is the subject";
$mail->body = "this is the html message body <b>in bold!</b>";
$mail->altbody = "this is the body in plain text for non-html mail clients";
echo $mail->subject;
try{
if(!$mail->send())
{
echo "message could not be sent. <p>";
echo "mailer error: " . $mail->errorinfo;
exit;
}
echo 'after mail send';
}
catch(exception $e) {
echo 'caught exception: ', $e->getmessage(), "\n";
}
echo "message has been sent";
?>
Also I have deployed in windows server.
Thanks in advance.

Answer 1

<h2>Feedback Form</h2>
<?php
// display form if user has not clicked submit
if (!isset($_POST["submit"])) {
?>
<form method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
From: <input type="text" name="from"><br>
Subject: <input type="text" name="subject"><br>
Message: <textarea rows="10" cols="40" name="message"></textarea><br>
<input type="submit" name="submit" value="Submit Feedback">
</form>
<?php
} else { // the user has submitted the form
// Check if the "from" input field is filled out
if (isset($_POST["from"])) {
$from = $_POST["from"]; // sender
$subject = $_POST["subject"];
$message = $_POST["message"];
// message lines should not exceed 70 characters (PHP rule), so wrap it
$message = wordwrap($message, 70);
// send mail
mail("webmaster#example.com",$subject,$message,"From: $from\n");
echo "Thank you for sending us feedback";
}
}
?>