Souke/frontend/models/ContactForm.php

<?php

namespace frontend\models;

use Yii;
use yii\base\Model;

/**
 * ContactForm is the model behind the contact form.
 */
class ContactForm extends Model {

    public $name;
    public $email;
    public $subject;
    public $body;
    public $verifyCode;

    /**
     * @inheritdoc
     */
    public function rules() {
        return [
            // name, email, subject and body are required
            [['name', 'email', 'subject', 'body'], 'required', 'message' => 'Champs obligatoire'],
            // email has to be a valid email address
            ['email', 'email', 'message' => 'Email incorrect'],
            // verifyCode needs to be entered correctly
            ['verifyCode', 'captcha', 'message' => 'Veuillez recopier le code de vérification'],
        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels() {
        return [
            'name' => 'Nom',
            'email' => 'Email',
            'subject' => 'Sujet',
            'body' => 'Message',
            'verifyCode' => 'Code de vérification',
        ];
    }

    /**
     * Sends an email to the specified email address using the information collected by this model.
     *
     * @param  string  $email the target email address
     * @return boolean whether the email was sent
     */
    public function sendEmail($email) {

        return Yii::$app->mailer->compose([
                'html' => 'contact-html',
                'text' => 'contact-text'], [ 'content' => $this->body,
                'nom' => $this->name
            ])
            ->setTo($email)
            ->setFrom([$this->email => $this->name])
            ->setSubject('[La boîte à pain] Contact : ' . $this->subject)
            ->send();
    }

}