Trying to use Zend mail object

Hi, so I've got a custom php script in a folder in my root folder. It isn't in the amember folder (that I renamed just 'members') because I couldn't post to it when it was. I'm trying to take the post data and email it to an email sent as a post data variable, not the users email. I'm trying to use the method outlined on the API/DI page of the documentation. I've included the 'bootstrap.php' so DI was available to me. It runs the code fine but catches when it trys to send the mail and gives me an error:

PHP:

<?php
include '../members/bootstrap.php';
if (isset($_POST["submit"])) {
$Artmail = $_POST["eml"];
$Uname = $_POST["uname"];
$Rname = $_POST["realname"];
$Umail = $_POST["umail"];
$message = $_POST["message"];
 
$subject = "Tattoo inquiry from ".$Rname;
 
$mail = Am_Di::getInstance()->mail; // create copy of Zend_Mail object, preconfigured by aMember
$mail->addTo($Artmail, $Rname);
$mail->setSubject($subject);
$mail->setBodyText($message);
try {
  $mail->send();
} catch (Exception $e) {
  echo "Error sending e-mail: " . $e->getMessage() . "\n";
}
 
echo "your message was sent ".$Uname;
}
?>