'To' address being added twice while using PHPmailer - php

Question

I am using PHPmailer to send mails. However, the mail is being sent to each user twice. Below is the screen-shot of a test mail.
The following is my code :
<?php
##REQUIRED FUNCTION
function send_mail_to($receiver, $msg)
{
$subject="[ TNP Update ] - Do you like the new look ?";
#Grab the PHPmailer class
require_once('./lib/phpmailer/phpmailer.inc.php');
#Create object
$mailer = new PHPmailer(); //Instantiate class
$mailer->From="tnp#aakashbhowmick.in";
$mailer->FromName="TNP Mailer";
$mailer->IsHTML(true);
$mailer->Subject = $subject;
$mailer->Body = $msg;
$mailer->AddAddress($receiver);
#Send the email
set_time_limit(300);
$mailer->Send();
} //End of send_mail_to()
###### THE WORKING CODE ######
#Only authorised access is allowed.
if($_POST['signature']=="some-secret-signature-here"){
$msg1=urldecode($_POST['text']);
# Formatting the message a little
$msg1=str_replace("#c0c0c0","#EAE99A",$msg1);
$msg1=str_replace("<td","<td style='font-family:Trebuchet MS,Verdana,arial'; ",$msg1);
#Start sending mails. Some lines commented for testing purpose
//include("connection.php");
//$result=mysql_query("SELECT * FROM subscribers");
$subscriber=array('id'=>'1','email'=>'aakashrocks#gmail.com','active'=>'1');
//while($subscriber=mysql_fetch_array($result)){
if($subscriber['active']==1){
$body="Some text";
send_mail_to($subscriber['email'], $body);
} #End-of-if
//} #End-of-while
} ##End of if
?>

Answer 1

I had the same problem, for me solution was to change
$mailer->isSMTP();
to
$mailer->Mailer = 'smtp';
So, try to use $mailer->Mailer.

Answer 2

May be there is a page refresh and hence multiple execution - Make sure the mail method is called only once by the browser for each reciever. To make sure, you could set a session variable upon sending and go into the send part only if session is not set.
if(!isset($_SESSION[$reciever]))
{
$_SESSION[$reciever] = 1;
\\mail code here
}
else{
echo "doing it more than once";
}
Also you can set $mailer->$SingleTo to true, so you would know if its multiple execution or single. You could also send the timestamp with the email for more debugging.

Answer 3

I had the same problem but using the SMTP connection.
I still don't know why but it happens when your recipient doesn't have a name.
So, instead of
$mailer->AddAddress($receiver);
Do
$mailer->AddAddress($receiver, 'Receiver name');
I hope it helps.

Answer 4

I was experiencing the same problem. In my case changing mail systems did the trick.
By default, phpMailer sends out email using Mail. Once I told it to use Sendmail instead, I stopped getting the duplicate address.
$email = new phpmailer;
$email->mailer = "sendmail";