How to use the Symfony mailer component to send emails?

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composer require symfony/mailer

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MAILER_DSN=gmail+smtp://<YOUR_GMAIL_ADDRESS>:<YOUR_GMAIL_PASSWORD>@smtp.gmail.com

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use SymfonyComponentMailerMailerInterface;

class MyController
{
    private $mailer;

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

    // ...
}

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use SymfonyComponentMailerMailerInterface;
use SymfonyComponentMimeEmail;

class MyController
{
    private $mailer;

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

    public function sendEmail()
    {
        $email = (new Email())
            ->from('sender@example.com')
            ->to('recipient@example.com')
            ->subject('Hello!')
            ->text('This is a test email.');

        $this->mailer->send($email);
    }
}