Send Email on Ticket Note (no longer working)

I had a hook made years ago that sends an email to techs when a note is made. We just moved our installation to a new server and new domain. WHMCS version is the same (v6) and the only change was a move from PHP 5.2 to 5.6. This is the code, can anyone see any problems with it?

<?php
if (!defined("WHMCS"))
   die("This file cannot be accessed directly");

function emailonaddticketnote_SendEmail($fromemail,$toemail, $fromname, $toname, $subject, $message)
{
 global $CONFIG;

 if($CONFIG['LogoURL'])
 {
   $sendmessage = '<p><a href="'.$CONFIG['Domain'].'" target="_blank"><img src="'.$CONFIG['LogoURL'].'" alt="'.$CONFIG['CompanyName'].'" border="0"></a></p>';
 }

 $sendmessage .= '<font style="font-family:Verdana;font-size:11px"><p>'.$message.'</p>';

 $mail = new PHPMailer();

 $mail->From = $fromemail;
 $mail->FromName = $fromname;
 $mail->Subject = $subject;
 $mail->CharSet = $CONFIG['Charset'];

 if($CONFIG['MailType'] == "mail")
 {
   $mail->Mailer = "mail";
 }
 elseif($CONFIG['MailType'] == "smtp") 
 {
   $mail->IsSMTP();
	$mail->Host = $CONFIG['SMTPHost'];
	$mail->Port = $CONFIG['SMTPPort'];
	$mail->Hostname = $_SERVER['SERVER_NAME'];

   if($CONFIG['SMTPSSL']) 
	{
    $mail->SMTPSecure = $CONFIG['SMTPSSL'];
	}

   if($CONFIG['SMTPUsername']) 
	{
	  $mail->SMTPAuth = true;
		$mail->Username = $CONFIG['SMTPUsername'];
		$mail->Password = decrypt($CONFIG['SMTPPassword']);
	}

	$mail->Sender = $CONFIG['Email'];
	$mail->AddReplyTo($fromemail, $fromname);
 }

 $mail->AddAddress($toemail, $toname);

 $message_text = str_replace("</p>", "\r\n\r\n", $sendmessage);
 $message_text = str_replace("<br>", "\r\n", $message_text);

 $message_text = str_replace("<br />", "\r\n", $message_text);

 $message_text = strip_tags($message_text);

 $mail->Body = $sendmessage;
 $mail->AltBody = $message_text;

$mail->Send();
$mail->ClearAddresses();

 return true;		
}


function emailonaddticketnote($vars) {
   global $CONFIG;
   $companyname = $CONFIG['CompanyName'];
$whmcsurl = $CONFIG['SystemURL'];

$readmins = mysql_query("SELECT `firstname`,`lastname` FROM `tbladmins` WHERE `id`='".$vars['adminid']."'");
$data = mysql_fetch_array($readmins);

   $query = mysql_query("SELECT `id` FROM `tbladminroles` WHERE `supportemails`='1'");
   while ($row = mysql_fetch_assoc($query)) {
       $queryb = mysql_query("SELECT `email`,`firstname`,`lastname` FROM `tbladmins` WHERE `roleid`='".$row['id']."'");
       while ($result = mysql_fetch_assoc($queryb)) {
		$ticketurl = $whmcsurl."/admin/supporttickets.php?action=view&id=".$vars['ticketid'];
       	$message = "Hello ".$result['firstname'].",<br /><br />A note has been added to ticket #".$vars['ticketid']."<br /><br />Note: ".$vars['message']."<br />By admin: ".ucwords($data['firstname']." ".$data['lastname']."<br /><br />To view the ticket please click here:<br/><a href='".$ticketurl."'>".$ticketurl."</a><br /><br />Thank You,<br>".$companyname);
           $fullname = $result['firstname'].' '.$result['lastname'];
           $email = $result['email'];
           emailonaddticketnote_SendEmail($email,$email, $companyname, $fullname, 'Note added to ticket #'.$vars['ticketid'], $message);
       }
   }
}

add_hook("TicketAddNote",1,"emailonaddticketnote");

Cheers. It's a useful hook, feel free to use it and make a note and see if it works. If it does then there is a misconfig in our system due to the changeover.

if it helps, i've just tried this hook on a v7.1beta dev installation using PHP 5.6 and it works fine... so I don't think PHP 5.6 is the issue... I would guess a mail setting error somewhere.

Hey Brian, one of my techs just fixed this. Under Settings > Mail we had no SSL and "localhost" set. We had to put the server hostname, SSL port and enable SSL. This system was running on cPanel before and now it's Plesk so perhaps there is some internal way that cPanel handles encrypted mail that differs to Plesk. Can't be bothered to dig into now but it works. Thanks for looking though!