diff --git a/src/Form/CustomerEditForm.php b/src/Form/CustomerEditForm.php
index 3a8ed73f..fb1c35fa 100644
--- a/src/Form/CustomerEditForm.php
+++ b/src/Form/CustomerEditForm.php
@@ -10,10 +10,10 @@
 namespace App\Form;
 
 use App\Entity\Customer;
+use App\Form\Type\MailType;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\CountryType;
 use Symfony\Component\Form\Extension\Core\Type\CurrencyType;
-use Symfony\Component\Form\Extension\Core\Type\EmailType;
 use Symfony\Component\Form\Extension\Core\Type\TelType;
 use Symfony\Component\Form\Extension\Core\Type\TextareaType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
@@ -88,8 +88,7 @@ class CustomerEditForm extends AbstractType
                 'required' => false,
                 'attr' => ['icon' => 'mobile'],
             ])
-            ->add('email', EmailType::class, [
-                'label' => 'label.email',
+            ->add('email', MailType::class, [
                 'required' => false,
             ])
             ->add('homepage', UrlType::class, [
diff --git a/src/Form/Type/MailType.php b/src/Form/Type/MailType.php
new file mode 100644
index 00000000..60b4f948
--- /dev/null
+++ b/src/Form/Type/MailType.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Form\Type;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Component\Validator\Constraints\Email;
+
+class MailType extends AbstractType
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefaults([
+            'label' => 'label.email',
+            'icon' => 'mail',
+            'constraints' => [
+                new Email(['mode' => 'loose'])
+            ],
+        ]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParent()
+    {
+        return TextType::class;
+    }
+}