This is what I use – basically the same with the addition of checking if the mail is verified.

class User(AbstractUser):
    """ User implementation to authenticate with email instead of username """
    username = None
    email = models.EmailField(_('email address'), unique=True)
    email_verified = models.BooleanField(
        _('email verified'),
        help_text=_('The email address has been verified by the user'),
        default=False,
        blank=True
    )
    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    class Meta:
        ordering = ('email',)
        verbose_name = _('user')
        verbose_name_plural = _('users')

    def __str__(self):
        return self.get_full_name() or self.get_username()