ok also ich hab verstanden:

formular.tpl:

Code:
<form action="send.php" method="post" enctype="multipart/form-data" id="formular">
 <input type="text" size="15" name="email" id="email" value="" />
 <input type="submit" value="Abschicken" />
</form>

index.php:

Code:
Hier gehts zum Formular


<?php
if($_GET['navigation_page'] == "formular") {
 include ("formular.tpl");
}
?>

send.php:

Code:
<?php
	if(!empty($_POST['email'])) { $_POST['email'] = mysql_real_escape_string($_POST['email']); 

	require("class/class.smtp.php");
	require("class/class.phpmailer.php");

		$email_text = "
			Email : $_POST[email]
		"; // Text

		$mail = new PHPMailer();
		$mail->From     = $absender_email;
		$mail->FromName = $absender_name;
		$mail->IsHTML(true); //Versand im HTML-Format festlegen

		$mail->Subject = "blabla"; // Betreff

		$mail->Body    = nl2br($email_text);
		$mail->AltBody = strip_tags($email_text);
		$mail->AddAddress($_POST['email']);
    		$mail->Send();
		$mail->ClearAddresses();
    } else {
    print "Emailfeld leer";
    }
?>
ist das korrekt?
Wenn ja verstehe ich dein problem nicht. ^^