how to use phpmailer()

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PHP

web_development

How do I use phpmailer() to send an html email containing an image. I've tried every possible way I know but can't seem to get it done. This is the code I am using:

require("class.phpmailer.php");

$msg = $_POST['msg'];
$subject = $_POST['subject'];


$mail = new PHPMailer();
#$mail = new PHPMailer();
$mail->IsSMTP();
$mail->Host = "branddesignexpress.com/cpanel";
$mail->SMTPAuth = true;
$mail->Username = 'admin@example.com';
$mail->Password = 'xxxxxx';

$mail->From="mailer@example.com";
$mail->FromName="My site's mailer";
$mail->Sender="mailer@example.com";
$mail->AddReplyTo("replies@example.com", "Replies for my site");

$mail->AddAddress("plasteezy@yahoo.com");
$mail->Subject = $subject;

$mail->IsHTML(true);
$mail->AddAttachment('http://www.branddesignexpress.com/images/homepage_mainimage.jpg', 'homepage_mainimage.jpg');
$mail->AddEmbeddedImage('homepage_mainimage.jpg', 'logoimg', 'homepage_mainimage.jpg'); // attach file logo.jpg, and later link to it using identfier logoimg
$mail->Body = $msg;
$mail->AltBody="This is text only alternative body.";

if(!$mail->Send())
{
   echo "Error sending: " . $mail->ErrorInfo;;
}
else
{
   echo "Letter is sent";
}

I always get the following error: SMTP Error: Could not connect to SMTP host. Error sending: SMTP Error: Could not connect to SMTP host.