$this->register_function('bcc', Array($this, 'addBcc'));
$this->register_function('subject', Array($this, 'setSubject'));
$this->register_function('add_header', Array($this, 'addHeader'));
$this->register_function('bcc', Array($this, 'addBcc'));
$this->register_function('subject', Array($this, 'setSubject'));
$this->register_function('add_header', Array($this, 'addHeader'));