CodeIgniter 4 email validation rules?

How can one effectively work with email validation rules in CodeIgniter 4, as explained by Online Web Tutor?

PHP Code:

public function sendMail(){
if ($this->request->getMethod() === 'post' && $this->validate([
        'subject' => 'required|min_length[3]|max_length[255]',
        'youremail'  => 'required',
        'emailbody'  => 'required',
    ])) {

    $email = \Config\Services::email();

$email->setFrom($this->request->getPost('youremail'), 'Your Name');
$email->setTo($this->request->getPost('youremail'));


$email->setSubject($this->request->getPost('subject'));
$email->setMessage($this->request->getPost('emailbody'));

$email->send(); 


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