phpmailer: Reply using only "Reply To" address

I have found the answer to this, and it is annoyingly/frustratingly simple! Basically the reply to addresses needed to be added before the from address as such:

$mail->addReplyTo('replyto@email.com', 'Reply to name');$mail->SetFrom('mailbox@email.com', 'Mailbox name');

Looking at the phpmailer code in more detail this is the offending line:

public function SetFrom($address, $name = '',$auto=1) {   $address = trim($address);   $name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim   if (!self::ValidateAddress($address)) {     $this->SetError($this->Lang('invalid_address').': '. $address);     if ($this->exceptions) {       throw new phpmailerException($this->Lang('invalid_address').': '.$address);     }     echo $this->Lang('invalid_address').': '.$address;     return false;   }   $this->From = $address;   $this->FromName = $name;   if ($auto) {      if (empty($this->ReplyTo)) {         $this->AddAnAddress('ReplyTo', $address, $name);      }      if (empty($this->Sender)) {         $this->Sender = $address;      }   }   return true;}

Specifically this line:

if (empty($this->ReplyTo)) {   $this->AddAnAddress('ReplyTo', $address, $name);}

Thanks for your help everyone!

At least in the current versions of PHPMailers, there's a function clearReplyTos() to empty the reply-to array.

    $mail->ClearReplyTos();    $mail->addReplyTo(example@example.com, 'EXAMPLE');