Adjusted email headers in contact form

See https://github.com/yiisoft/yii2-app-advanced/issues/426

config/params.php

@@ -2,4 +2,6 @@
 
 return [
     'adminEmail' => 'admin@example.com',
+    'senderEmail' => 'noreply@example.com',
+    'senderName' => 'Example.com mailer',
 ];

models/ContactForm.php

@@ -52,7 +52,8 @@ class ContactForm extends Model
         if ($this->validate()) {
             Yii::$app->mailer->compose()
                 ->setTo($email)
-                ->setFrom([$this->email => $this->name])
+                ->setFrom([Yii::$app->params['senderEmail'] => Yii::$app->params['senderName']])
+                ->setReplyTo([$this->email => $this->name])
                 ->setSubject($this->subject)
                 ->setTextBody($this->body)
                 ->send();