diff --git a/docker/gunicorn.py b/docker/gunicorn.py
index ca4b67fe..7c76d82c 100644
--- a/docker/gunicorn.py
+++ b/docker/gunicorn.py
@@ -1,5 +1,7 @@
 import json
 
+import gunicorn
+
 accesslog = "-"
 errorlog = "-"
 access_log_format = json.dumps(
@@ -27,6 +29,4 @@
 chdir = "/app"
 
 # Obfuscate the Server header (to the md5sum of "Springload")
-import gunicorn
-
 gunicorn.SERVER_SOFTWARE = "04e96149a2f64d6135c82d199ab62122"
diff --git a/ietf/blog/models.py b/ietf/blog/models.py
index 67fafe00..d5cb757b 100644
--- a/ietf/blog/models.py
+++ b/ietf/blog/models.py
@@ -298,7 +298,7 @@ def serve(self, request, *args, **kwargs):
             try:
                 topic_id = int(topic_id)
             except ValueError:
-                raise Http404
+                raise Http404 from None
             filter_topic = get_object_or_404(Topic, id=topic_id)
             query_string_segments = []
             for parameter, _function in parameter_functions_map.items():
diff --git a/ietf/forms/models.py b/ietf/forms/models.py
index d8ac5075..98aed430 100644
--- a/ietf/forms/models.py
+++ b/ietf/forms/models.py
@@ -33,7 +33,7 @@ def send_mail(self, form):
             super().send_mail(form)
         except Exception as ex:
             logger.error(f"Failed to send email with exception: {ex}")
-            raise EmailException
+            raise EmailException from ex
 
     def serve(self, request, *args, **kwargs):
         try:
@@ -42,7 +42,7 @@ def serve(self, request, *args, **kwargs):
             messages.add_message(
                 request, messages.ERROR, message="Failed to send email"
             )
-            raise EmailException
+            raise
 
 
 FormPage.content_panels = [
diff --git a/ietf/settings/dev.py b/ietf/settings/dev.py
index 817442aa..b593a467 100644
--- a/ietf/settings/dev.py
+++ b/ietf/settings/dev.py
@@ -1,4 +1,6 @@
-from .base import *
+import contextlib
+
+from .base import *  # noqa: F403
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
@@ -15,7 +17,5 @@
 CELERY_EAGER_PROPAGATES_EXCEPTIONS = True
 CELERY_ALWAYS_EAGER = True
 
-try:  # pragma: no cover
-    from .local import *
-except ImportError:  # pragma: no cover
-    pass
+with contextlib.suppress(ImportError):
+    from .local import *  # noqa: F403
diff --git a/ietf/settings/docker/__init__.py b/ietf/settings/docker/__init__.py
index f835ce9b..4e665532 100644
--- a/ietf/settings/docker/__init__.py
+++ b/ietf/settings/docker/__init__.py
@@ -5,7 +5,7 @@
     StringVariable,
 )
 
-from ..base import *
+from ..base import *  # noqa: F403
 
 _ENVVARS = [
     StringVariable(
@@ -31,4 +31,4 @@
 
 FillVars(_ENVVARS, vars())
 FillVars(_DJANGO_ENVVARS, vars(), "DJANGO_")
-ALLOWED_HOSTS = ADDRESSES
+ALLOWED_HOSTS = ADDRESSES  # noqa: F405
diff --git a/ietf/settings/docker/base.py b/ietf/settings/docker/base.py
index c9059d3c..9cde3a0b 100644
--- a/ietf/settings/docker/base.py
+++ b/ietf/settings/docker/base.py
@@ -1,3 +1,3 @@
-from . import *
-from .grains.database import *
-from .grains.logging import *
+from . import *  # noqa: F403
+from .grains.database import *  # noqa: F403
+from .grains.logging import *  # noqa: F403
diff --git a/ietf/settings/docker/dev.py b/ietf/settings/docker/dev.py
index 99684588..8923e8be 100644
--- a/ietf/settings/docker/dev.py
+++ b/ietf/settings/docker/dev.py
@@ -1,4 +1,4 @@
-from .base import *
+from .base import *  # noqa: F403
 
 DEBUG = True
 CACHE_MIDDLEWARE_ALIAS = "dummy"
diff --git a/ietf/settings/production.py b/ietf/settings/production.py
index bcb86499..84ff4736 100644
--- a/ietf/settings/production.py
+++ b/ietf/settings/production.py
@@ -1,6 +1,7 @@
+import contextlib
 import os
 
-from .base import *
+from .base import *  # noqa: F403
 
 # Do not set SECRET_KEY, Postgres or LDAP password or any other sensitive data here.
 # Instead, create a local.py file on the server.
@@ -40,7 +41,7 @@
     SERVER_EMAIL = env["SERVER_EMAIL"]
 
 if "CACHE_PURGE_URL" in env:
-    INSTALLED_APPS += ("wagtail.contrib.frontend_cache",)
+    INSTALLED_APPS += ("wagtail.contrib.frontend_cache",)  # noqa: F405
     WAGTAILFRONTENDCACHE = {
         "default": {
             "BACKEND": "wagtail.contrib.frontend_cache.backends.HTTPBackend",
@@ -75,10 +76,10 @@
 # Caches
 
 if "CACHE_DEFAULT" in env:
-    CACHES["default"]["LOCATION"] = env.get("CACHE_DEFAULT")
+    CACHES["default"]["LOCATION"] = env.get("CACHE_DEFAULT")  # noqa: F405
 
 if "CACHE_SESSIONS" in env:
-    CACHES["sessions"]["LOCATION"] = env.get("CACHE_SESSIONS")
+    CACHES["sessions"]["LOCATION"] = env.get("CACHE_SESSIONS")  # noqa: F405
 
 
 # Logging
@@ -119,7 +120,5 @@
     LOGGING["loggers"]["django.request"]["handlers"].append("errors_file")
     LOGGING["loggers"]["django.security"]["handlers"].append("errors_file")
 
-try:
-    from .local import *  # pyflakes:ignore
-except ImportError:
-    pass
+with contextlib.suppress(ImportError):
+    from .local import *  # noqa: F403