Programmer's Reference Guide
Arbitrary mail headers can be set by using the addHeader() method. It requires two
parameters containing the name and the value of the header field. A third optional parameter determines
if the header should have only one or multiple values:
Example 27.10. Adding E-Mail Message Headers
<?php
require_once 'Zend/Mail.php';
$mail = new Zend_Mail();
$mail->addHeader('X-MailGenerator', 'MyCoolApplication');
$mail->addHeader('X-greetingsTo', 'Mom', true); // multiple values
$mail->addHeader('X-greetingsTo', 'Dad', true);
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