/**
* Return all mail headers as an array
*
* If a boundary is given, a multipart header is generated with a
* Content-Type of either multipart/alternative or multipart/mixed depending
* on the mail parts present in the {@link $_mail Zend_Mail object} present.
*
* @param string $boundary
* @return array
*/
protected function _getHeaders($boundary)
{
if (null !== $boundary) {
// Build multipart mail
$type = $this->_mail->getType();
if (!$type) {
if ($this->_mail->hasAttachments) {
$type = Zend_Mime::MULTIPART_MIXED;
} elseif ($this->_mail->getBodyText() && $this->_mail->getBodyHtml()) {
$type = Zend_Mime::MULTIPART_ALTERNATIVE;
} else {
$type = Zend_Mime::MULTIPART_MIXED;
}
}
$this->_headers['Content-Type'] = array(
$type . '; charset="' . $this->_mail->getCharset() . '";'
. $this->EOL
. " " . 'boundary="' . $boundary . '"'
);
$this->_headers['MIME-Version'] = array('1.0');
$this->boundary = $boundary;
}
return $this->_headers;
}