protected function _createBoundary()
    {
        if ($this->_attachments || $this->_emailFormat === 'both') {
            $this->_boundary = md5(Security::randomBytes(16));
        }
    }
protected function _createBoundary()
    {
        if ($this->_attachments || $this->_emailFormat === 'both') {
            $this->_boundary = md5(Security::randomBytes(16));
        }
    }
protected function _createBoundary ( ) { if ( $ this -> _attachments || $ this -> _emailFormat === 'both' ) { $ this -> _boundary = md5 ( Security :: randomBytes ( 16 ) ) ; } }
Create unique boundary identifier

@return void
Create unique boundary identifier