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<sect1 id="zend.mail.boundary">
    <title>Controlling the MIME Boundary</title>

    <para>
        In a multipart message, a <acronym>MIME</acronym> boundary for separating the different
        parts of the message is normally generated at random. In some cases, however, you might
        want to specify the <acronym>MIME</acronym> boundary that is used. This can be done using
        the <methodname>setMimeBoundary()</methodname> method, as in the following example:
    </para>

    <example id="zend.mail.boundary.example-1">
        <title>Changing the MIME Boundary</title>
        <programlisting language="php"><![CDATA[
$mail = new Zend_Mail();
$mail->setMimeBoundary('=_' . md5(microtime(1) . $someId++));
// build message...
]]></programlisting>
    </example>
</sect1>
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