diff --git a/chatmaild/src/chatmaild/greeterbot.py b/chatmaild/src/chatmaild/greeterbot.py
index 6dac6afe..ae398e7d 100644
--- a/chatmaild/src/chatmaild/greeterbot.py
+++ b/chatmaild/src/chatmaild/greeterbot.py
@@ -52,7 +52,7 @@ def setup_account(data_dir: str, debug: bool) -> deltachat.Account:
         configtracker = ac.configure()
         try:
             configtracker.wait_finish()
-        except ConfigureFailed as e:
+        except ConfigureFailed:
             print(
                 "configuration setup failed for %s with password:\n%s"
                 % (ac.get_config("addr"), ac.get_config("mail_pw"))
@@ -88,10 +88,16 @@ class GreetBot:
                 print("Inviting", user)
                 contact = self.account.create_contact(user)
                 chat = contact.create_chat()
-                chat.send_text("Welcome to %s! Here you can try out Delta Chat." % (self.domain,))
-                chat.send_text("I prepared some webxdc apps for you, if you are interested:")
+                chat.send_text(
+                    "Welcome to %s! Here you can try out Delta Chat." % (self.domain,)
+                )
+                chat.send_text(
+                    "I prepared some webxdc apps for you, if you are interested:"
+                )
                 chat.send_file(pkg_resources.resource_filename(__name__, "editor.xdc"))
-                chat.send_file(pkg_resources.resource_filename(__name__, "tower-builder.xdc"))
+                chat.send_file(
+                    pkg_resources.resource_filename(__name__, "tower-builder.xdc")
+                )
                 chat.send_text(
                     "You can send a message to xstore@testrun.org to discover more apps! "
                     "Some of these games you can also play with friends, directly in the chat."
@@ -101,7 +107,9 @@ class GreetBot:
 def main():
     args = configargparse.ArgumentParser()
     args.add_argument("--db_path", help="location of the Delta Chat database")
-    args.add_argument("--passdb", default=PASSDB_PATH, help="location of the chatmail passdb")
+    args.add_argument(
+        "--passdb", default=PASSDB_PATH, help="location of the chatmail passdb"
+    )
     args.add_argument("--show-ffi", action="store_true", help="print Delta Chat log")
     ops = args.parse_args()
 
diff --git a/cmdeploy/src/cmdeploy/__init__.py b/cmdeploy/src/cmdeploy/__init__.py
index 12a1f821..4fd0b969 100644
--- a/cmdeploy/src/cmdeploy/__init__.py
+++ b/cmdeploy/src/cmdeploy/__init__.py
@@ -257,7 +257,9 @@ def _configure_postfix(config: Config, debug: bool = False) -> bool:
     need_restart |= master_config.changed
 
     header_cleanup = files.put(
-        src=importlib.resources.files(__package__).joinpath("postfix/submission_header_cleanup"),
+        src=importlib.resources.files(__package__).joinpath(
+            "postfix/submission_header_cleanup"
+        ),
         dest="/etc/postfix/submission_header_cleanup",
         user="root",
         group="root",
diff --git a/cmdeploy/src/cmdeploy/dns.py b/cmdeploy/src/cmdeploy/dns.py
index 14fa5443..4f2af9b3 100644
--- a/cmdeploy/src/cmdeploy/dns.py
+++ b/cmdeploy/src/cmdeploy/dns.py
@@ -4,7 +4,6 @@ import requests
 import importlib
 import subprocess
 import datetime
-from ipaddress import ip_address
 
 
 class DNS: