diff --git a/.env b/.env
index 9a278df..755766b 100644
--- a/.env
+++ b/.env
@@ -20,6 +20,6 @@ APP_SECRET=
 ###< symfony/framework-bundle ###
 
 ###> symfony/mailer ###
-MAILER_DSN=${MAILER_DSN:-smtp://localhost:1025}
+MAILER_DSN=smtp://${MAILER_USER:-null}:${MAILER_PASSWORD:-null}@${MAILER_HOST:-localhost}:${MAILER_PORT:-1025}
 CONTACT_MAIL=${CONTACT_MAIL:-contact@localhost}
 ###< symfony/mailer ###
diff --git a/src/Form/ContactForm.php b/src/Form/ContactForm.php
index b967b37..9fecf8d 100644
--- a/src/Form/ContactForm.php
+++ b/src/Form/ContactForm.php
@@ -4,7 +4,6 @@ namespace App\Form;
 
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\EmailType;
-use Symfony\Component\Form\Extension\Core\Type\SubmitType;
 use Symfony\Component\Form\Extension\Core\Type\TextareaType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\FormBuilderInterface;