sendmail: Do not copy rules with subevent when closing an event (Z#23233683) (#6156)

src/pretix/plugins/sendmail/migrations/0011_remove_cross_event_scheduled_mails.py

@@ -0,0 +1,19 @@
+from django.db import migrations
+from django.db.models import F
+
+
+def remove_cross_event_scheduled_mails(apps, schema_editor):
+    Rule = apps.get_model("sendmail", "Rule")
+    ScheduledMail = apps.get_model("sendmail", "ScheduledMail")
+    ScheduledMail.objects.filter(rule__subevent__isnull=False).exclude(rule__subevent__event=F('rule__event')).delete()
+    Rule.objects.filter(subevent__isnull=False).exclude(subevent__event=F('event')).delete()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("sendmail", "0010_auto_20250801_1342"),
+    ]
+
+    operations = [
+        migrations.RunPython(remove_cross_event_scheduled_mails),
+    ]

src/pretix/plugins/sendmail/signals.py

@@ -232,7 +232,7 @@ def sendmail_copy_data_receiver(sender, other, item_map, **kwargs):
     if sender.sendmail_rules.exists():  # idempotency
         return
 
-    for r in other.sendmail_rules.prefetch_related('limit_products'):
+    for r in other.sendmail_rules.filter(subevent__isnull=True).prefetch_related('limit_products'):
         limit_products = list(r.limit_products.all())
         r = copy.copy(r)
         r.pk = None