Zend_Mail Plugin abstraction class

From time to time it is handy to be able quickly set special options when sending mails using Zend_Mail, such as automatically adding footer text or toggling between HTML and plaintext mails. In order to satisfy these needs I wrote the following simple abstraction class as a wrapper around Zend_Mail.

/**
 * An abstraction class for Zend_Mail.
 * @author matthias.kerstner
 */
class Custom_Plugin_Mailer {

    /**
     * Assembles $mail but does not send it.
     * @param array $to
     * @param string $subject
     * @param string $body
     * @param array? $from
     * @param bool? $html
     * @param bool? $appendSignature
     * @param bool? $archive
     * @param string? $encoding
     * @param Zend_Locale? $locale
     * @return bool|Zend_Mail 
     */
    public static function assemble($to, $subject, $body, $from = null, $html = false, $appendSignature = true, $archive = true, $encoding = 'UTF-8', $locale = null) {
        return self::send($to, $subject, $body, $from, $html, $appendSignature, $archive, $encoding, false, $locale);
    }

    /**
     * Sends mail.
     * @param array $to [0=email, 1=name]
     * @param string $subject
     * @param string $body
     * @param array? $from [0=email, 1=name]
     * @param bool? $html
     * @param bool? $appendSignature
     * @param bool? $archive
     * @param string? $encoding
     * @param bool? $sendDirectly
     * @param Zend_Locale? $locale
     * @param array? $toBCC [0=email, 1=name]
     * @return bool|Zend_Mail true on success, false on error, Zend_Mail 
     *         if $sendDirectly is false
     */
    public static function send($to, $subject, $body, $from = null, $html = false, $appendSignature = true, $archive = true, $encoding = 'UTF-8', $sendDirectly = true, $locale = null, $toBCC = null) {
        $config = Zend_Registry::get('Zend_Config');
        $translate = Zend_Registry::get('Zend_Translate');
        $_locale = $locale instanceof Zend_Locale ? $locale : Zend_Registry::get('Zend_Locale');
        $mail = new Zend_Mail($encoding);

        if (APPLICATION_ENV !== 'production') { // DEBUG MODE
            $mail->setFrom($config->email->noreply->email, $config->email->noreply->sender);
            $mail->addTo($config->email->debug->email, $config->email->debug->sender);
        } else { // PRODUCTION MODE
            if ($from === null) {
                $mail->setFrom($config->email->noreply->email, $config->email->noreply->sender);
            } else {
                if (is_array($from) && count($from) == 2) {
                    $mail->setFrom($from[0], $from[1]);
                } else {
                    throw new Exception('Failed to send email');
                }
            }

            if (is_array($to) && count($to) == 2) {
                $mail->addTo($to[0], $to[1]);
            } else {
                throw new Exception('Failed to send email');
            }
        }

        $mail->setSubject($subject);

        if ($appendSignature) {
            $br = $html ? "<br>" : "\n";
            $body .= $br . $br
                    . $translate->_('DEFAULT.MAIL.SIGNATURE', $_locale);
        }

        if ($html) {
            $mail->setBodyHtml($body);
        } else {
            $mail->setBodyText($body);
        }

        if ($archive) {
            $mail->addBcc($config->email->archive->email, $config->email->archive->sender);
        }

        // BCC
        if (is_array($toBCC) && count($toBCC) == 2) {
            $mailBCC = new Zend_Mail($encoding);
            $mailBCC->setFrom($config->email->noreply->email, $config->email->noreply->sender);
            $mailBCC->addTo($toBCC[0], $toBCC[1]);
            $mailBCC->setSubject("BCC: " . $subject);
            if ($html) {
                $mailBCC->setBodyHtml("BCC:<br />" . $body);
            } else {
                $mailBCC->setBodyText("BCC:\n" . $body);
            }
            $mailBCC->send();
        }

        if (!$sendDirectly) {
            return $mail;
        }

        try {
            if (!$mail->send()) {
                throw new Exception('Failed to send mail to "'
                        . $to[0] . '" with subject "' . $subject . '"');
            }
        } catch (Exception $e) {
            return false;
        }

        return true;
    }

}