laravel10中使用队列发送邮件，每一封邮件都需要从数据库读取单独的邮件服务配置，目前只能通过发送前设置config解决，寻求更优的解决方案

去看了一下10的文档，跟之前的方式差别很多，我的猜测是，之所以每次都需要重新获取配置是因为这个：
laravel10中文文档-邮件-备用配置

有时，已经配置好用于发送应用程序邮件的外部服务可能已关闭。在这种情况下，定义一个或多个备份邮件传递配置非常有用，这些配置将在主传递驱动程序关闭时使用。
为此，应该在应用程序的 mail 配置文件中定义一个使用 failover 传输的邮件程序。应用程序的 failover 邮件程序的配置数组应包含一个 mailers 数组，该数组引用选择邮件驱动程序进行传递的顺序：

'mailers' => [
    'failover' => [
        'transport' => 'failover',
        'mailers' => [
            'postmark',
            'mailgun',
            'sendmail',
        ],
    ],

    // ...
],

可能是为了确保所有的驱动的配置能用性提高吧。

问题已解决，重写mailable类并重写send方法，具体代码如下：

    public function send($mailer)
    {
        $config['host'] = $this->config['smtp_server'];
        $config['username'] = $this->config['smtp_username'];
        $config['password'] = $this->config['smtp_password'];
        $config['port'] = $this->config['smtp_port'];
        $config['scheme'] = "smtp";
        $config['encryption'] = $this->config['smtp_tls'] == 'none' ? "" : $this->config['smtp_tls'];
        $config['verify_peer'] = false;
        $config['verify_peer_name'] = false;

        $factory = new EsmtpTransportFactory;

        $scheme = $config['scheme'] ?? null;

        if (!$scheme) {
            $scheme = !empty($config['encryption']) && $config['encryption'] === 'tls'
                ? (($config['port'] == 465) ? 'smtps' : 'smtp')
                : '';
        }

        $transport = $factory->create(new Dsn(
            $scheme,
            $config['host'],
            $config['username'] ?? null,
            $config['password'] ?? null,
            $config['port'] ?? null,
            $config
        ));

        $mailer->setSymfonyTransport($transport);
        return $this->withLocale($this->locale, function () use ($mailer) {
            $this->prepareMailableForDelivery();

            $mailer = $mailer instanceof MailFactory
                ? $mailer->mailer($this->mailer)
                : $mailer;

            return $mailer->send($this->buildView(), $this->buildViewData(), function ($message) {
                $this->buildFrom($message)
                    ->buildRecipients($message)
                    ->buildSubject($message)
                    ->buildTags($message)
                    ->buildMetadata($message)
                    ->runCallbacks($message)
                    ->buildAttachments($message);
            });
        });
    }

我们自用的配置 数据库取出配置然后发送邮件

public function __construct(string $email,string $nickname, string $smtp, int $port, string $username, string $password, bool $is_ssl)
    {
        $this->email = $email;
        $this->nickname = $nickname;
        $this->smtp = $smtp;
        $this->port = $port;
        $this->username = $username;
        $this->password = $password;
        $this->is_ssl = $is_ssl;
        $this->initTransport();

    }

    private function initTransport()
    {
        $transport = $transport = new Swift_SmtpTransport($this->smtp, $this->port, $this->is_ssl ? 'ssl' : '');
        $transport->setUsername($this->username);
        $transport->setPassword($this->password);
        $this->transport = $transport;
        return $this;
    }

    /**
     * @param       $to
     * @param       $subject
     * @param       $content
     * @param array $cc
     * @param array $attach
     */
    public function send($to, $subject, $content, $attach = [], $cc = [])
    {
        // 备份初始设置
        $backup = \Mail::getSwiftMailer();
        $mailer = new \Swift_Mailer($this->transport);
        \Mail::setSwiftMailer($mailer);
        \Mail::send('mail', ['html' => $content], function (Message $message) use ($to, $subject, $attach, $cc) {
            $message->from($this->email,$this->nickname);
            $message->subject($subject);
            $message->cc($cc);
            $message->to($to);
            if (isset($attach['file'])) {
                $message->attach($attach['file'], $attach['options'] ? $attach['options'] : []);
            }
        });
        // 还原初始配置
        \Mail::setSwiftMailer($backup);
    }

可以把这部分代码替换掉就支持队列了

 \Mail::send('mail', ['html' => $content], function (Message $message) use ($to, $subject, $attach, $cc) {
            $message->from($this->email,$this->nickname);
            $message->subject($subject);
            $message->cc($cc);
            $message->to($to);
            if (isset($attach['file'])) {
                $message->attach($attach['file'], $attach['options'] ? $attach['options'] : []);
            }
        });

替换成

Mail::to($request->user())
    ->cc($moreUsers)
    ->bcc($evenMoreUsers)
    ->queue(new OrderShipped($order));

正常使用Mail就行了