function message_compose($p)
    {
        $engine = $this->enigma->load_engine();

        // skip: message has no signed/encoded content
        if (!$this->enigma->engine) {
            return $p;
        }

        $engine = $this->enigma->engine;
        $locks  = (array) $this->rc->config->get('enigma_options_lock');

        // Decryption status
        foreach ($engine->decryptions as $status) {
            if ($status instanceof enigma_error) {
                $code = $status->getCode();

                if ($code == enigma_error::KEYNOTFOUND) {
                    $msg = rcube::Q(str_replace('$keyid', enigma_key::format_id($status->getData('id')),
                        $this->enigma->gettext('decryptnokey')));
                }
                else if ($code == enigma_error::BADPASS) {
                    $this->password_prompt($status, array('compose-init' => true));
                    return $p;
                }
                else {
                    $msg = rcube::Q($this->enigma->gettext('decrypterror'));
                }
            }
        }

        if ($msg) {
            $this->rc->output->show_message($msg, 'error');
        }

        // Check sign/ecrypt options for signed/encrypted drafts
        if (!in_array('encrypt', $locks)) {
            $this->rc->output->set_env('enigma_force_encrypt', !empty($engine->decryptions));
        }
        if (!in_array('sign', $locks)) {
            $this->rc->output->set_env('enigma_force_sign', !empty($engine->signatures));
        }

        return $p;
    }