assertValidAddresses example

    public function create(
        string $subject,
        array $sender,
        array $recipients,
        array $contents,
        array $attachments,
        array $additionalData,
        ?array $binAttachments = null
    ): Email {
        $this->assertValidAddresses(array_keys($recipients));

        $mail = (new Mail())
            ->subject($subject)
            ->from(...$this->formatMailAddresses($sender))
            ->to(...$this->formatMailAddresses($recipients))
            ->setMailAttachmentsConfig($additionalData['attachmentsConfig'] ?? null);

        foreach ($contents as $contentType => $data) {
            if ($contentType === 'text/html') {
                $mail->html($data);
            } else {