php email, code reuse fails on second include - php

Question

I posted earlier as an email and relocation issue, however after trying several things, and tracing (in production! yech!)
I have found the culprit - but have NO IDEA why or where to go from here.
you will see in the below code I include 'email.php' twice - because one receipt goes to the user, the other includes some meta data about the user and goes to support...
if i comment out the SECOND include, my redirect works, if i leave it in, it bombs...
the notify email is valid, and is the only thing that is different.
Im at a loss
PHP FORM PROCESSOR
...
// send two emails
$_emailTo = $email; // the email of the person requesting
$_emailBody = $text_body; // the stock response with things filled in
include ( 'email.php' );
$_emailTo = $notifyEmail; // the support email address
$_emailBody = $pretext.$text_body; // pretext added as meta data for support w/ same txt sent to user
//I make it this far in my trace - then nothing
include ( 'email.php' );
// relocate
echo '<META HTTP-EQUIV="Refresh" Content="0; URL=success.php" >';
exit;
PHP MAILER (email.php)
<?php
require 'phpmailer/class.phpmailer.php';
//Create a new PHPMailer instance
$mail = new PHPMailer();
//Tell PHPMailer to use SMTP
$mail->IsSMTP();
//Enable SMTP debugging
// 0 = off (for production use)
// 1 = client messages
// 2 = client and server messages
$mail->SMTPDebug = 0;
//Set the hostname of the mail server
$mail->Host = "mail.validmailserver.com";
//Set the SMTP port number - likely to be 25, 465 or 587
$mail->Port = 26;
//Whether to use SMTP authentication
$mail->SMTPAuth = true;
//Username to use for SMTP authentication
$mail->Username = "validusername";
//Password to use for SMTP authentication
$mail->Password = "pass1234";
//Set who the message is to be sent from
$mail->SetFrom('me#validmailserver.com', 'no-reply # this domain');
//Set an alternative reply-to address
//$mail->AddReplyTo('no-reply#validmailserver.com','Support');
//Set who the message is to be sent to
$mail->AddAddress( $_emailTo );
$mail->Subject = $_emailSubject;
$mail->MsgHTML( $_emailBody );
$_emailError = false;
//Send the message, check for errors
if( !$mail -> Send() ) {
$_emailError = true;
echo "Mailer Error: " . $mail->ErrorInfo;
}
?>
help - please

Answer 1

It's the require in email.php that is causing the problems. If you want to make the least change possible and make it work, change it to require_once. This will ensure "phpmailer/class.phpmailer.php" is only loaded once, therefore the class will only be defined once.

Answer 2

take the require() line from email.php and put it in the calling file