def __validate_users_blob_emails(self, emails):
                invalid_emails = []
                for email in emails:
                    try:
                        validate_email(email)
                    except ValidationError:
                        invalid_emails.append(email)
                if invalid_emails:
                    self.add_error(
                        'users_blob',
                        gettext_lazy('Invalid email addresses: %(emails)s') % {
                            'emails': ', '.join(sorted(invalid_emails))
                        }
                    )