from django.core.mail import send_mail
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=Zayavka)
def send_email_to_manager(sender, instance, created, **kwargs):
    if created:
        manager_email = Manager.objects.get(id=instance.manager_id).email
        subject = 'New zayavka'
        message = f"новая заявка от {instance.name} / тема письма: {instance.question} / email отправителя: {instance.email}"
        from_email = 'vetrof@yandex.ru'
        recipient_list = [manager_email]
        send_mail(subject, message, from_email, recipient_list)

from django.apps import AppConfig


class MainConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'main'

    def ready(self):
        import main.signals