public function sendUnencrypted(Message $message, bool $force = false)
    {
        if (!$this->serverKeyFingerprint) {
            if ($force) {
                // Unencrypted, unsigned
                $message->setBody($message->getBodyText());
            }
            return;
        }
        $this->mailer->send(
            // Unencrypted, signed:
            $this->sign($message)
        );
    }