symfony 3 use 'strict' => true in email validation field

Question

i want to add 'strict' => true to email validation input in form building https://symfony.com/doc/3.3/reference/constraints/Email.html#strict

why? because normal email validation allow invalid emails ex. test@test passed!

i tried but i get error (The option "strict" does not exist. Defined options are: "action", "allow_extra_fields", "attr", ... )

code like that:

public function buildForm(FormBuilderInterface $builder, array $options) :void
{
     $builder
     ->add('name', TextType::class, [ 'label' => 'Name' ])
     ->add('email', EmailType::class, [
           'label' => 'Email', 
           'strict' => true ]  <<<<< not work
     )
     ->add('subject', ChoiceType::class, [ 'label' => 'Subject',
     ...

Answer 1

Try to register validation constraints like below:

$builder
     ->add('name', TextType::class, [ 'label' => 'Name' ])
     ->add('email', EmailType::class, [
           'label' => 'Email', 
           'constraints' => array(
               new Email(array('strict'=>true)),
            )
       )

Answer 2

In addition to adding 'strict' => true to Email the constraint options, there is also a setting in the Symfony framework config to enable it for all Email constraints by default. See strict_email configuration in the Symfony docs v3.4

For Symfony >=4.1 the configuration option strict_email has been deprecated so use email_validation_mode instead