Final Class Yiisoft\Mailer\Symfony\EmailFactory

                public function create(MessageInterface $message): Email
{
    $email = new Email();
    $from = $this->convertStringsToAddresses($message->getFrom());
    if ($from !== null) {
        $email = $email->from(...$from);
    }
    $to = $this->convertStringsToAddresses($message->getTo());
    if ($to !== null) {
        $email = $email->to(...$to);
    }
    $replyTo = $this->convertStringsToAddresses($message->getReplyTo());
    if ($replyTo !== null) {
        $email = $email->replyTo(...$replyTo);
    }
    $cc = $this->convertStringsToAddresses($message->getCc());
    if ($cc !== null) {
        $email = $email->cc(...$cc);
    }
    $bcc = $this->convertStringsToAddresses($message->getBcc());
    if ($bcc !== null) {
        $email = $email->bcc(...$bcc);
    }
    $subject = $message->getSubject();
    if ($subject !== null) {
        $email = $email->subject($subject);
    }
    $priority = $message->getPriority();
    if ($priority !== null) {
        $email = $email->priority($priority->value);
    }
    $charset = $message->getCharset();
    $textBody = $message->getTextBody();
    if ($textBody !== null) {
        $email = $email->text($textBody, $charset ?? 'utf-8');
    }
    $htmlBody = $message->getHtmlBody();
    if ($htmlBody !== null) {
        $email = $email->html($htmlBody, $charset ?? 'utf-8');
    }
    $returnPath = $message->getReturnPath();
    if ($returnPath !== null) {
        $email->returnPath($returnPath);
    }
    $sender = $message->getSender();
    if ($sender !== null) {
        $email->sender($sender);
    }
    $date = $message->getDate();
    if ($date !== null) {
        $email->date($date);
    }
    $emailHeaders = $email->getHeaders();
    foreach ($message->getHeaders() ?? [] as $name => $values) {
        foreach ($values as $value) {
            match ($name) {
                'Date' => $emailHeaders->addDateHeader($name, new DateTimeImmutable($value)),
                'Message-ID' => $emailHeaders->addIdHeader($name, $value),
                default => $emailHeaders->addTextHeader($name, $value),
            };
        }
    }
    foreach ($message->getAttachments() ?? [] as $file) {
        $email->addPart(
            $this->createDataPartFromFile($file)
        );
    }
    foreach ($message->getEmbeddings() ?? [] as $file) {
        $email->addPart(
            $this->createDataPartFromFile($file)->asInline()
        );
    }
    return $email;
}