$cabeceras .= 'To: María <[email protected]>, Kelly <[email protected]>' . "\r\n";$cabeceras .= 'From: Recordatorio de Cumpleaños <[email protected]>' . "\r\n";$cabeceras .= 'Cc: [email protected]' . "\r\n";$cabeceras .= 'Bcc: [email protected]' . "\r\n";