Use mail_admins instead of send_mail.

src/accounting/signals.py

@@ -1,7 +1,6 @@
 """Loaded with the AppConfig.ready() method."""
 
-from django.conf import settings
-from django.core.mail import send_mail
+from django.core.mail import mail_admins
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from django.utils import timezone
@@ -15,11 +14,9 @@ from . import models
 def check_total_amount(sender: models.Payment, instance: models.Payment, **kwargs: dict) -> None:  # noqa: ARG001
     """Check that we receive Payments with the correct amount."""
     if instance.amount != instance.order.total_with_vat:
-        send_mail(
+        mail_admins(
             "Payment received: wrong amount",
             f"Please check payment ID {instance.pk}",
-            settings.DEFAULT_FROM_EMAIL,
-            settings.ADMINS,
         )
 
 

src/accounting/views.py

@@ -3,7 +3,7 @@
 import stripe
 from django.conf import settings
 from django.contrib.sites.models import Site
-from django.core.mail import send_mail
+from django.core.mail import mail_admins
 from django.db import transaction
 from django.http import HttpRequest
 from django.http import HttpResponse
@@ -80,7 +80,7 @@ def order_pay(request: HttpRequest, order_id: int) -> HttpResponse:
             cancel_url=base_domain + "/cancel",
         )
     except Exception as e:
-        send_mail("Error in checkout", str(e), settings.DEFAULT_FROM_EMAIL, settings.ADMINS)
+        mail_admins("Error in checkout", str(e))
         raise
 
     # TODO: Redirect with status=303

src/project/settings.py

@@ -127,6 +127,7 @@ EMAIL_BACKEND = env.str(
     default="django.core.mail.backends.console.EmailBackend",
 )
 DEFAULT_FROM_EMAIL = env.str("DEFAULT_FROM_EMAIL", default="")
+SERVER_EMAIL = env.str("SERVER_EMAIL", default=DEFAULT_FROM_EMAIL)
 # Parse email URLs, e.g. "smtp://"
 email = env.dj_email_url("EMAIL_URL", default="smtp://")
 EMAIL_HOST = email["EMAIL_HOST"]