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We have implemented SwiftMailer for you in this codebase. To use it, you may refer to this example.

// As an example we can use the Mailer service in a Controller.
// We can inject the service from the class Constructor.
class HelloController
{
    /**
     * @var Swift_Mailer
     */
    protected $mailer;

    /**
     * @param Swift_Mailer $mailer
     */
    public function __construct(Swift_Mailer $mailer)
    {
        $this->mailer = $mailer;
    }
}

// Then we can just call the Mailer from any Controller method.
$message = (new Swift_Message('Hello from PHP Challenge'))
    ->setFrom(['phpchallenge@jobsity.io' => 'PHP Challenge'])
    ->setTo(['user@domain.org'])
    ->setBody('SwiftMailer is awesome!.');

// Later just do the actual email sending.
$this->mailer->send($message);

For more information about SwiftMailer, please visit:

https://swiftmailer.symfony.com/docs/introduction.html

For additional information about the Dependency Container, please refer to:

https://www.slimframework.com/docs/v4/concepts/di.html