diff --git a/config/settings/base.py b/config/settings/base.py
index 8cf4fdc..f72f99a 100644
--- a/config/settings/base.py
+++ b/config/settings/base.py
@@ -149,7 +149,6 @@
     "django.middleware.csrf.CsrfViewMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
-    "django.middleware.common.BrokenLinkEmailsMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
     "reversion.middleware.RevisionMiddleware",
     "allauth.account.middleware.AccountMiddleware",
diff --git a/config/settings/production.py b/config/settings/production.py
index 1756902..5f56a22 100644
--- a/config/settings/production.py
+++ b/config/settings/production.py
@@ -187,6 +187,9 @@
             "maxBytes": 1024 * 1024 * 15,  # 15MB
             "backupCount": 10,
         },
+        "null": {
+            "class": "logging.NullHandler",
+        },
     },
     "root": {"level": "INFO", "handlers": ["console"]},
     "loggers": {
@@ -200,10 +203,12 @@
             "level": "ERROR",
             "propagate": True,
         },
+        # Bots hitting the ALB by IP send a Host header not in ALLOWED_HOSTS.
+        # Django already answers 400; logging these just buries real errors
+        # (and would trigger mail_admins if that's ever enabled).
         "django.security.DisallowedHost": {
-            "level": "ERROR",
-            "handlers": ["console"],
-            "propagate": True,
+            "handlers": ["null"],
+            "propagate": False,
         },
         "anymail": {
             "handlers": ["console", "applogfile"],
diff --git a/teleband/dashboards/views.py b/teleband/dashboards/views.py
index 6345f6b..d590fc8 100644
--- a/teleband/dashboards/views.py
+++ b/teleband/dashboards/views.py
@@ -199,8 +199,8 @@ def test_func(self):
 
     def get_context_data(self, **kwargs):
         ctx = super().get_context_data(**kwargs)
-        ctx["courses"] = (
-            Course.objects.select_related("owner").order_by("-start_date", "name")
+        ctx["courses"] = Course.objects.select_related("owner").order_by(
+            "-start_date", "name"
         )
         return ctx
 
@@ -238,9 +238,7 @@ def research_data_view(request):
     atts_by_sub = defaultdict(list)
     for att in attachments:
         if att.file:
-            atts_by_sub[att.submission_id].append(
-                {"id": att.id, "url": att.file.url}
-            )
+            atts_by_sub[att.submission_id].append({"id": att.id, "url": att.file.url})
 
     subs_by_ca = defaultdict(list)
     for sub in submissions:
@@ -270,9 +268,7 @@ def research_data_view(request):
                 assn_data["submissions"].append(
                     {
                         "id": sub.id,
-                        "student": sub.enrollment.user.id
-                        if sub.enrollment
-                        else None,
+                        "student": sub.enrollment.user.id if sub.enrollment else None,
                         "instrument": str(sub.instrument) if sub.instrument else None,
                         "submitted": sub.submitted.strftime("%Y-%m-%d %H:%M"),
                         "content": sub.content,