mail.php

    <?php
    
    /**
     * @var string
     *
     * @ORM\Column(name="email", type="string", length=255)
     *
     * @Assert\Email(groups={"registration"}, message="Ungültige Email-Adresse.")
     * @Assert\NotBlank(groups={"registration"}, message="Email-Adresse darf nicht leer sein.")
     */
    private $email;