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<sect1 id="zend.mail.additional-headers">
    <title>Additional Headers</title>
    <para>
        Arbitrary mail headers can be set by using the <code>addHeader()</code> 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:
    </para>
    <example id="zend.mail.additional-headers.example-1">
        <title>Adding E-Mail Message Headers</title>
        <programlisting language="php"><![CDATA[
$mail = new Zend_Mail();
$mail->addHeader('X-MailGenerator', 'MyCoolApplication');
$mail->addHeader('X-greetingsTo', 'Mom', true); // multiple values
$mail->addHeader('X-greetingsTo', 'Dad', true);
]]></programlisting>
    </example>

    <para>To set the Reply-To: header there exists the function <code>setReplyTo($email, $name=null)</code>,
        because it requires additional special escaping of the different parts (email and name).</para>

</sect1>
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