Symfony :如何使用多个邮件？

swiftmailer:
    default_mailer: mailer1
    mailers:
        mailer1:
            transport: smtp
            host: smtp.example.com
            port: 587
            encryption: tls
            username: your_username
            password: your_password
        mailer2:
            transport: smtp
            host: smtp.example2.com
            port: 587
            encryption: tls
            username: your_username2
            password: your_password2

use Symfony\Component\Mailer\MailerInterface;
use Symfony\Component\Mime\Email;

class MyController
{
    private $mailer;

    public function __construct(MailerInterface $mailer)
    {
        $this->mailer = $mailer;
    }

    public function sendEmail()
    {
        $email1 = (new Email())
            ->from('sender@example.com')
            ->to('recipient@example.com')
            ->subject('Email from mailer1')
            ->text('Hello from mailer1');

        $email2 = (new Email())
            ->from('sender@example.com')
            ->to('recipient@example.com')
            ->subject('Email from mailer2')
            ->text('Hello from mailer2');

        $this->mailer->send($email1, 'mailer1');
        $this->mailer->send($email2, 'mailer2');
    }
}