def save(self, *args, **kwargs):
    should_send_email = False
    if self.pk:
        deuda_actual = Enterprise.objects.get(pk=self.pk).ammount_of_doubt
        if self.has_doubt:
            if self.ammount_of_doubt != deuda_actual:
                should_send_email = True
    else:
        should_send_email = self.has_doubt

    if should_send_email:
        mensaje = """Hola asdasda """
        send_mail("Notificacion", mensaje, "misclientes@pescatun.alinet.cu", [self.email], fail_silently=True)
        self.emailed = True
    super(Enterprise, self).save(*args, **kwargs)