Question

Using PHPMailer to send individual emails to recipients I’m getting nothing in the To: field when I add $mail->SingleTo = TRUE; to my code.

When I remove $mail->SingleTo = TRUE; I receive emails with an email address in the To: field that is correct.

This is what I get:

reply-to     xxxxxx <[e-mail]>, No Reply <[e-mail]>
to    
date         Mon, Mar 21, 2011 at 5:07 PM  
subject      Testing    
mailed-by    gmail.com 
signed-by    gmail.com

(where xxxxxxx represents my email address.)

Here’s my code:

if(isset($_POST['submit']))
{
    require_once('PHPMailer_v5.1/class.phpmailer.php');


$mail         = new PHPMailer();

$subject = $_POST['subject'];
$body    = $_POST['emailbody'];
$to         = $_POST['to'];



$mail->IsSMTP(); // telling the class to use SMTP
//$mail->Host       = "localhost"; // SMTP server
$mail->SMTPDebug  = 2;                     // enables SMTP debug information (for testing)
                                           // 1 = errors and messages
                                           // 2 = messages only
$mail->SMTPAuth   = true;                  // enable SMTP authentication
$mail->SMTPSecure = "SSL";                 // sets the prefix to the servier
$mail->Host       = "smtp.gmail.com";      // sets GMAIL as the SMTP server
$mail->Port       = 587;                   // set the SMTP port for the GMAIL server
$mail->Username   = "[e-mail]";  // GMAIL username
$mail->Password   = "*********";            // GMAIL password

$mail->SetFrom('[e-mail]', 'XXXXXX');

$mail->AddReplyTo("[e-mail]","No Reply");

$mail->Subject    = $subject;

// After adding this line I'm getting an empty To: field 
$mail->SingleTo   = TRUE;

$mail->AddAddress("[e-mail]", 'xyz abc');
$mail->AddAddress("[e-mail]", 'abc xyz');
//$mail->AltBody    = "To view the message, please use an HTML compatible email viewer!"; // optional, comment out and test

$mail->MsgHTML($body);


if(!$mail->Send()) {
  $message= "Mailer Error: " . $mail->ErrorInfo;
}
else
{
  $message= "Message sent!";
}       
}

Answer 1

You are using SMTP to send email. The phpmailer class is not using the SingleTo parameter when senting using Smtp.

More, if you see the CreateHeader function when the SingleTo == true the recipents are only aded to $this->SingleToArray and not to the header itself so basically it PHPmailer bug.

Looks like the only choice, unless you want to patch phpmailer, is to send email one-by-one without using SingleTo property

the solution will be

function & prepare_mailer($subject, $body) {

    $mail         = new PHPMailer();
    $mail->IsSMTP(); // telling the class to use SMTP
    //$mail->Host       = "localhost"; // SMTP server
    $mail->SMTPDebug  = 2;                     // enables SMTP debug information (for testing)
                                               // 1 = errors and messages
                                               // 2 = messages only
    $mail->SMTPAuth   = true;                  // enable SMTP authentication
    $mail->SMTPSecure = "SSL";                 // sets the prefix to the servier
    $mail->Host       = "smtp.gmail.com";      // sets GMAIL as the SMTP server
    $mail->Port       = 587;                   // set the SMTP port for the GMAIL server
    $mail->Username   = "[e-mail]";  // GMAIL username
    $mail->Password   = "*********";            // GMAIL password
    $mail->SetFrom('[e-mail]', 'XXXXXX');
    $mail->AddReplyTo("[e-mail]","No Reply");
    $mail->Subject    = $subject;
    $mail->MsgHTML($body);
    return $mail;
}

foreach( $_POST['to'] as $to ){
    $mail = null;
    $mail = & prepare_mailer($_POST['subject'],$_POST['body']);
    $mail->AddAddress($to['address'], $to['name']);
    $mail->Send();

}