An easy example how to send feedback emails in yii2 (Advanced template)

common\config\main-local.php

<?php
return [
    'components' => [
      
        ...
        
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'viewPath' => '@common/mail',
            // send all mails to a file by default. You have to set
            // 'useFileTransport' to false and configure a transport
            // for the mailer to send real emails.

            'transport' => [
                'class'      => 'Swift_SmtpTransport',
                'host'       => 'smtp-pulse.com',
                'username'   => '[email protected]',
                'password'   => 'aSDASDASDASDAS', // your password
                'port'       => '2525',
//                'encryption' => 'tls',
            ],

//            'useFileTransport' => true,
        ],
    ],
];

common\config\params.php

<?php
return [
    ...
    'supportEmail' => '[email protected]',

    'siteName' => 'My Super site',
  
    ...
];

common\mail\adminFeedback-html.php

<?php
use yii\helpers\Html;

/* @var $this yii\web\View */
/* @var $name  string user name*/
/* @var $email string user email */
/* @var $body  string the review */

?>
<div class="admin-feedback">
    <p><?= Html::encode($name) ?>(<?= Html::encode($email) ?>) wrote new review.</p>

    <blockquote>
        <?= Html::encode($body) ?>
    </blockquote>
</div>

common\mail\adminFeedback-text.php

<?php

/* @var $this yii\web\View */
/* @var $name  string user name*/
/* @var $email string user email */
/* @var $body  string the review */

?>
<?= $name ?>(<?= $email ?>) wrote new review.

The review:
<?= $body ?>

common\mail\userFeedback-html.php

<?php
use yii\helpers\Html;

/* @var $this yii\web\View */
/* @var $name  string user name*/
/* @var $email string user email */
/* @var $body  string the review */

?>
<div class="user-feedback">
    <p><?= Html::encode($name) ?>, thank you for send the review.</p>

    <p>This very helpful for us</p>
</div>

common\mail\userFeedback-text.php

<?php

/* @var $this yii\web\View */
/* @var $name  string user name*/
/* @var $email string user email */
/* @var $body  string the review */

?>
<?= $name ?>, thank you for send the review.

This is very helpful for us.

frontend\controllers\SiteController.php

<?php
namespace frontend\controllers;

use Yii;
...

/**
 * Site controller
 */
class SiteController extends Controller
{
    ...
    
    /**
     * Displays contact page.
     *
     * @return mixed
     */
    public function actionContact()
    {
        $model = new ContactForm();
        if (...) {
            if ($model->sendEmail(Yii::$app->params['supportEmail'])) {
                ...
            } else {
                ...
            }

        ...
    }
    
    ...
}
// Other code was not changed. Only adminEmail to supportEmail

frontend\models\ContactForm.php

<?php

namespace frontend\models;

...

/**
 * ContactForm is the model behind the contact form.
 */
class ContactForm extends Model
{
    ...
    
    public function sendEmail($supportEmail)
    {
        $adminSuccess = Yii::$app
            ->mailer
            ->compose(
                ['html' => 'adminFeedback-html', 'text' => 'adminFeedback-text'],
                [
                    'email' => $this->email,
                    'body'  => $this->body,
                    'name'  => $this->name,
                    'supportEmail' => $supportEmail,
                ]
            )
            ->setFrom([$supportEmail => Yii::$app->params['siteName'] . ' bot'])
            ->setTo($supportEmail)
            ->setSubject('There is new question :' . $this->subject)
            ->send();

        $userSuccess = Yii::$app
            ->mailer
            ->compose(
                ['html' => 'userFeedback-html', 'text' => 'userFeedback-text'],
                [
                    'email' => $this->email,
                    'body'  => $this->body,
                    'name'  => $this->name,
                    'supportEmail' => $supportEmail,
                ]
            )
            ->setFrom([$supportEmail => Yii::$app->params['siteName'] . ' bot'])
            ->setTo($this->email)
            ->setSubject('Than you for wrote review on ' . Yii::$app->params['siteName'])
            ->send();

        return $userSuccess && $adminSuccess;
    }
}