diff --git a/chatmaild/pyproject.toml b/chatmaild/pyproject.toml
index 64416f8..861ee26 100644
--- a/chatmaild/pyproject.toml
+++ b/chatmaild/pyproject.toml
@@ -36,6 +36,16 @@ log_format = "%(asctime)s %(levelname)s %(message)s"
 log_date_format = "%Y-%m-%d %H:%M:%S"
 log_level = "INFO"
 
+[tool.ruff]
+lint.select = [
+  "F", # Pyflakes
+  "I", # isort
+
+  "PLC", # Pylint Convention
+  "PLE", # Pylint Error
+  "PLW", # Pylint Warning
+]
+
 [tool.tox]
 legacy_tox_ini = """
 [tox]
@@ -47,10 +57,9 @@ skipdist = True
 skip_install = True
 deps =
   ruff
-  black
 commands =
-  black --quiet --check --diff src/
-  ruff src/
+  ruff format --quiet --diff src/
+  ruff check src/
 
 [testenv]
 deps = pytest 
diff --git a/chatmaild/src/chatmaild/database.py b/chatmaild/src/chatmaild/database.py
index a7197e1..1e232c1 100644
--- a/chatmaild/src/chatmaild/database.py
+++ b/chatmaild/src/chatmaild/database.py
@@ -1,5 +1,5 @@
-import sqlite3
 import contextlib
+import sqlite3
 import time
 from pathlib import Path
 
diff --git a/chatmaild/src/chatmaild/doveauth.py b/chatmaild/src/chatmaild/doveauth.py
index f6ffb4c..74e1f78 100644
--- a/chatmaild/src/chatmaild/doveauth.py
+++ b/chatmaild/src/chatmaild/doveauth.py
@@ -1,18 +1,18 @@
+import crypt
+import json
 import logging
 import os
-import time
 import sys
-import json
-import crypt
+import time
 from pathlib import Path
 from socketserver import (
-    UnixStreamServer,
     StreamRequestHandler,
     ThreadingMixIn,
+    UnixStreamServer,
 )
 
+from .config import Config, read_config
 from .database import Database
-from .config import read_config, Config
 
 NOCREATE_FILE = "/etc/chatmail-nocreate"
 
diff --git a/chatmaild/src/chatmaild/echo.py b/chatmaild/src/chatmaild/echo.py
index 32049eb..4a09809 100644
--- a/chatmaild/src/chatmaild/echo.py
+++ b/chatmaild/src/chatmaild/echo.py
@@ -6,11 +6,11 @@ it will echo back any message that has non-empty text and also supports the /hel
 
 import logging
 import os
-import sys
 import subprocess
+import sys
+from pathlib import Path
 
 from deltachat_rpc_client import Bot, DeltaChat, EventType, Rpc, events
-from pathlib import Path
 
 from chatmaild.config import read_config
 from chatmaild.newemail import create_newemail_dict
diff --git a/chatmaild/src/chatmaild/filedict.py b/chatmaild/src/chatmaild/filedict.py
index 5be5830..c86b94a 100644
--- a/chatmaild/src/chatmaild/filedict.py
+++ b/chatmaild/src/chatmaild/filedict.py
@@ -1,9 +1,10 @@
-import os
-import logging
 import json
-import filelock
+import logging
+import os
 from contextlib import contextmanager
 
+import filelock
+
 
 class FileDict:
     """Concurrency-safe multi-reader/single-writer persistent dict."""
diff --git a/chatmaild/src/chatmaild/filtermail.py b/chatmaild/src/chatmaild/filtermail.py
index 0a0a8cd..87231fd 100644
--- a/chatmaild/src/chatmaild/filtermail.py
+++ b/chatmaild/src/chatmaild/filtermail.py
@@ -1,14 +1,14 @@
 #!/usr/bin/env python3
 import asyncio
 import logging
-import time
 import sys
-from email.parser import BytesParser
+import time
 from email import policy
+from email.parser import BytesParser
 from email.utils import parseaddr
+from smtplib import SMTP as SMTPClient
 
 from aiosmtpd.controller import Controller
-from smtplib import SMTP as SMTPClient
 
 from .config import read_config
 
diff --git a/chatmaild/src/chatmaild/metadata.py b/chatmaild/src/chatmaild/metadata.py
index e3f7d7f..582cd78 100644
--- a/chatmaild/src/chatmaild/metadata.py
+++ b/chatmaild/src/chatmaild/metadata.py
@@ -1,17 +1,16 @@
-from pathlib import Path
-from socketserver import (
-    UnixStreamServer,
-    StreamRequestHandler,
-    ThreadingMixIn,
-)
-import sys
 import logging
 import os
+import sys
+from pathlib import Path
+from socketserver import (
+    StreamRequestHandler,
+    ThreadingMixIn,
+    UnixStreamServer,
+)
 
 from .filedict import FileDict
 from .notifier import Notifier
 
-
 DICTPROXY_HELLO_CHAR = "H"
 DICTPROXY_LOOKUP_CHAR = "L"
 DICTPROXY_ITERATE_CHAR = "I"
diff --git a/chatmaild/src/chatmaild/metrics.py b/chatmaild/src/chatmaild/metrics.py
index e037724..af7c1ab 100644
--- a/chatmaild/src/chatmaild/metrics.py
+++ b/chatmaild/src/chatmaild/metrics.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
-from pathlib import Path
-import time
 import sys
+import time
+from pathlib import Path
 
 
 def main(vmail_dir=None):
diff --git a/chatmaild/src/chatmaild/newemail.py b/chatmaild/src/chatmaild/newemail.py
index 2c14458..fbf976a 100644
--- a/chatmaild/src/chatmaild/newemail.py
+++ b/chatmaild/src/chatmaild/newemail.py
@@ -1,13 +1,13 @@
 #!/usr/local/lib/chatmaild/venv/bin/python3
 
-""" CGI script for creating new accounts. """
+"""CGI script for creating new accounts."""
 
 import json
 import random
 import secrets
 import string
 
-from chatmaild.config import read_config, Config
+from chatmaild.config import Config, read_config
 
 CONFIG_PATH = "/usr/local/lib/chatmaild/chatmail.ini"
 ALPHANUMERIC = string.ascii_lowercase + string.digits
diff --git a/chatmaild/src/chatmaild/notifier.py b/chatmaild/src/chatmaild/notifier.py
index 2f49fe1..6800cce 100644
--- a/chatmaild/src/chatmaild/notifier.py
+++ b/chatmaild/src/chatmaild/notifier.py
@@ -25,15 +25,16 @@ The meaning and format of tokens is basically a matter of Delta-Chat Core and
 the `notification.delta.chat` service.
 """
 
+import logging
+import math
 import os
 import time
-import math
-import logging
-from uuid import uuid4
-from threading import Thread
+from dataclasses import dataclass
 from pathlib import Path
 from queue import PriorityQueue
-from dataclasses import dataclass
+from threading import Thread
+from uuid import uuid4
+
 import requests
 
 
diff --git a/chatmaild/src/chatmaild/tests/plugin.py b/chatmaild/src/chatmaild/tests/plugin.py
index 98dc83b..7f34fa7 100644
--- a/chatmaild/src/chatmaild/tests/plugin.py
+++ b/chatmaild/src/chatmaild/tests/plugin.py
@@ -1,14 +1,14 @@
-import random
-from pathlib import Path
-import os
 import importlib.resources
 import itertools
-from email.parser import BytesParser
+import os
+import random
 from email import policy
-import pytest
+from email.parser import BytesParser
+from pathlib import Path
 
-from chatmaild.database import Database
+import pytest
 from chatmaild.config import read_config, write_initial_config
+from chatmaild.database import Database
 
 
 @pytest.fixture
diff --git a/chatmaild/src/chatmaild/tests/test_doveauth.py b/chatmaild/src/chatmaild/tests/test_doveauth.py
index e9a4563..b2649f1 100644
--- a/chatmaild/src/chatmaild/tests/test_doveauth.py
+++ b/chatmaild/src/chatmaild/tests/test_doveauth.py
@@ -1,18 +1,18 @@
 import io
 import json
-import pytest
 import queue
 import threading
 import traceback
 
 import chatmaild.doveauth
+import pytest
+from chatmaild.database import DBError
 from chatmaild.doveauth import (
     get_user_data,
-    lookup_passdb,
-    handle_dovecot_request,
     handle_dovecot_protocol,
+    handle_dovecot_request,
+    lookup_passdb,
 )
-from chatmaild.database import DBError
 
 
 def test_basic(db, example_config):
diff --git a/chatmaild/src/chatmaild/tests/test_filtermail.py b/chatmaild/src/chatmaild/tests/test_filtermail.py
index 9421844..091e035 100644
--- a/chatmaild/src/chatmaild/tests/test_filtermail.py
+++ b/chatmaild/src/chatmaild/tests/test_filtermail.py
@@ -1,12 +1,11 @@
+import pytest
 from chatmaild.filtermail import (
-    check_encrypted,
     BeforeQueueHandler,
     SendRateLimiter,
+    check_encrypted,
     check_mdn,
 )
 
-import pytest
-
 
 @pytest.fixture
 def maildomain():
diff --git a/chatmaild/src/chatmaild/tests/test_metadata.py b/chatmaild/src/chatmaild/tests/test_metadata.py
index 23028d8..c24bfbf 100644
--- a/chatmaild/src/chatmaild/tests/test_metadata.py
+++ b/chatmaild/src/chatmaild/tests/test_metadata.py
@@ -1,12 +1,12 @@
 import io
-import pytest
-import requests
 import time
 
+import pytest
+import requests
 from chatmaild.metadata import (
-    handle_dovecot_request,
-    handle_dovecot_protocol,
     Metadata,
+    handle_dovecot_protocol,
+    handle_dovecot_request,
 )
 from chatmaild.notifier import (
     Notifier,
diff --git a/cmdeploy/pyproject.toml b/cmdeploy/pyproject.toml
index 3502a30..807b245 100644
--- a/cmdeploy/pyproject.toml
+++ b/cmdeploy/pyproject.toml
@@ -16,7 +16,6 @@ dependencies = [
   "build",
   "tox",
   "ruff",
-  "black",
   "pytest",
   "pytest-xdist", 
   "imap_tools",
@@ -31,3 +30,13 @@ cmdeploy = "cmdeploy.cmdeploy:main"
 
 [tool.pytest.ini_options]
 addopts = "-v -ra --strict-markers"
+
+[tool.ruff]
+lint.select = [
+  "F", # Pyflakes
+  "I", # isort
+
+  "PLC", # Pylint Convention
+  "PLE", # Pylint Error
+  "PLW", # Pylint Warning
+]
diff --git a/cmdeploy/src/cmdeploy/__init__.py b/cmdeploy/src/cmdeploy/__init__.py
index 6ecab52..db5cad6 100644
--- a/cmdeploy/src/cmdeploy/__init__.py
+++ b/cmdeploy/src/cmdeploy/__init__.py
@@ -2,20 +2,20 @@
 Chat Mail pyinfra deploy.
 """
 
-import sys
 import importlib.resources
-import subprocess
-import shutil
 import io
+import shutil
+import subprocess
+import sys
 from pathlib import Path
 
+from chatmaild.config import Config, read_config
 from pyinfra import host
-from pyinfra.operations import apt, files, server, systemd, pip
 from pyinfra.facts.files import File
 from pyinfra.facts.systemd import SystemdEnabled
-from .acmetool import deploy_acmetool
+from pyinfra.operations import apt, files, pip, server, systemd
 
-from chatmaild.config import read_config, Config
+from .acmetool import deploy_acmetool
 
 
 def _build_chatmaild(dist_dir) -> None:
@@ -486,19 +486,19 @@ def deploy_chatmail(config_path: Path) -> None:
 
     # Add our OBS repository for dovecot_no_delay
     files.put(
-        name = "Add Deltachat OBS GPG key to apt keyring",
-        src = importlib.resources.files(__package__).joinpath("obs-home-deltachat.gpg"),
-        dest = "/etc/apt/keyrings/obs-home-deltachat.gpg",
+        name="Add Deltachat OBS GPG key to apt keyring",
+        src=importlib.resources.files(__package__).joinpath("obs-home-deltachat.gpg"),
+        dest="/etc/apt/keyrings/obs-home-deltachat.gpg",
         user="root",
         group="root",
         mode="644",
     )
 
     files.line(
-        name = "Add DeltaChat OBS home repository to sources.list",
-        path = "/etc/apt/sources.list",
-        line = "deb [signed-by=/etc/apt/keyrings/obs-home-deltachat.gpg] https://download.opensuse.org/repositories/home:/deltachat/Debian_12/ ./",
-        ensure_newline = True,
+        name="Add DeltaChat OBS home repository to sources.list",
+        path="/etc/apt/sources.list",
+        line="deb [signed-by=/etc/apt/keyrings/obs-home-deltachat.gpg] https://download.opensuse.org/repositories/home:/deltachat/Debian_12/ ./",
+        ensure_newline=True,
     )
 
     apt.update(name="apt update", cache_time=24 * 3600)
diff --git a/cmdeploy/src/cmdeploy/acmetool/__init__.py b/cmdeploy/src/cmdeploy/acmetool/__init__.py
index 2034a4f..4e47d46 100644
--- a/cmdeploy/src/cmdeploy/acmetool/__init__.py
+++ b/cmdeploy/src/cmdeploy/acmetool/__init__.py
@@ -1,8 +1,8 @@
 import importlib.resources
 
-from pyinfra.operations import apt, files, systemd, server
 from pyinfra import host
 from pyinfra.facts.systemd import SystemdStatus
+from pyinfra.operations import apt, files, server, systemd
 
 
 def deploy_acmetool(email="", domains=[]):
diff --git a/cmdeploy/src/cmdeploy/cmdeploy.py b/cmdeploy/src/cmdeploy/cmdeploy.py
index bde9b75..8675434 100644
--- a/cmdeploy/src/cmdeploy/cmdeploy.py
+++ b/cmdeploy/src/cmdeploy/cmdeploy.py
@@ -4,19 +4,18 @@ along with command line option and subcommand parsing.
 """
 
 import argparse
-import shutil
-import subprocess
 import importlib.resources
 import importlib.util
 import os
+import shutil
+import subprocess
 import sys
 from pathlib import Path
 
-
-from termcolor import colored
 from chatmaild.config import read_config, write_initial_config
-from cmdeploy.dns import show_dns, check_necessary_dns
+from termcolor import colored
 
+from cmdeploy.dns import check_necessary_dns, show_dns
 
 #
 # cmdeploy sub commands and options
@@ -157,26 +156,26 @@ def fmt_cmd_options(parser):
 
 
 def fmt_cmd(args, out):
-    """Run formattting fixes (ruff and black) on all chatmail source code."""
+    """Run formattting fixes on all chatmail source code."""
 
     sources = [str(importlib.resources.files(x)) for x in ("chatmaild", "cmdeploy")]
-    black_args = [shutil.which("black")]
-    ruff_args = [shutil.which("ruff")]
+    format_args = [shutil.which("ruff"), "format"]
+    check_args = [shutil.which("ruff"), "check"]
 
     if args.check:
-        black_args.append("--check")
+        format_args.append("--diff")
     else:
-        ruff_args.append("--fix")
+        check_args.append("--fix")
 
     if not args.verbose:
-        black_args.append("-q")
-        ruff_args.append("-q")
+        check_args.append("--quiet")
+        format_args.append("--quiet")
 
-    black_args.extend(sources)
-    ruff_args.extend(sources)
+    format_args.extend(sources)
+    check_args.extend(sources)
 
-    out.check_call(" ".join(black_args), quiet=not args.verbose)
-    out.check_call(" ".join(ruff_args), quiet=not args.verbose)
+    out.check_call(" ".join(format_args), quiet=not args.verbose)
+    out.check_call(" ".join(check_args), quiet=not args.verbose)
     return 0
 
 
@@ -232,7 +231,7 @@ class Out:
         if not quiet:
             cmdstring = " ".join(args)
             self(f"[$ {cmdstring}]", file=sys.stderr)
-        proc = subprocess.run(args, env=env)
+        proc = subprocess.run(args, env=env, check=False)
         return proc.returncode
 
 
diff --git a/cmdeploy/src/cmdeploy/deploy.py b/cmdeploy/src/cmdeploy/deploy.py
index d7d4e03..ef259ad 100644
--- a/cmdeploy/src/cmdeploy/deploy.py
+++ b/cmdeploy/src/cmdeploy/deploy.py
@@ -1,6 +1,8 @@
-import os
 import importlib.resources
+import os
+
 import pyinfra
+
 from cmdeploy import deploy_chatmail
 
 
diff --git a/cmdeploy/src/cmdeploy/dns.py b/cmdeploy/src/cmdeploy/dns.py
index a3e0e85..46b20e0 100644
--- a/cmdeploy/src/cmdeploy/dns.py
+++ b/cmdeploy/src/cmdeploy/dns.py
@@ -1,9 +1,9 @@
+import datetime
+import importlib
+import subprocess
 import sys
 
 import requests
-import importlib
-import subprocess
-import datetime
 
 
 class DNS:
@@ -104,8 +104,8 @@ def show_dns(args, out) -> int:
             return 0
         except TypeError:
             pass
-        for line in zonefile.splitlines():
-            line = line.format(
+        for raw_line in zonefile.splitlines():
+            line = raw_line.format(
                 acme_account_url=acme_account_url,
                 sts_id=datetime.datetime.now().strftime("%Y%m%d%H%M"),
                 chatmail_domain=args.config.mail_domain,
diff --git a/cmdeploy/src/cmdeploy/genqr.py b/cmdeploy/src/cmdeploy/genqr.py
index 5d84cf5..35c3a97 100644
--- a/cmdeploy/src/cmdeploy/genqr.py
+++ b/cmdeploy/src/cmdeploy/genqr.py
@@ -1,8 +1,9 @@
 import importlib
-import qrcode
-import os
-from PIL import ImageFont, ImageDraw, Image
 import io
+import os
+
+import qrcode
+from PIL import Image, ImageDraw, ImageFont
 
 
 def gen_qr_png_data(maildomain):
diff --git a/cmdeploy/src/cmdeploy/tests/online/test_0_login.py b/cmdeploy/src/cmdeploy/tests/online/test_0_login.py
index 0b7a861..f2eb8ea 100644
--- a/cmdeploy/src/cmdeploy/tests/online/test_0_login.py
+++ b/cmdeploy/src/cmdeploy/tests/online/test_0_login.py
@@ -1,9 +1,10 @@
-import pytest
-import threading
 import queue
 import socket
+import threading
 
+import pytest
 from chatmaild.config import read_config
+
 from cmdeploy.cmdeploy import main
 
 
diff --git a/cmdeploy/src/cmdeploy/tests/online/test_1_basic.py b/cmdeploy/src/cmdeploy/tests/online/test_1_basic.py
index 198df6e..63dea5f 100644
--- a/cmdeploy/src/cmdeploy/tests/online/test_1_basic.py
+++ b/cmdeploy/src/cmdeploy/tests/online/test_1_basic.py
@@ -1,4 +1,5 @@
 import smtplib
+
 import pytest
 
 
diff --git a/cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py b/cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py
index cb11a42..a75ab28 100644
--- a/cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py
+++ b/cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py
@@ -1,11 +1,11 @@
-import time
-import re
+import ipaddress
 import random
+import re
+import time
 
+import imap_tools
 import pytest
 import requests
-import ipaddress
-import imap_tools
 
 
 @pytest.fixture
diff --git a/cmdeploy/src/cmdeploy/tests/plugin.py b/cmdeploy/src/cmdeploy/tests/plugin.py
index 943a0dd..c78866f 100644
--- a/cmdeploy/src/cmdeploy/tests/plugin.py
+++ b/cmdeploy/src/cmdeploy/tests/plugin.py
@@ -1,17 +1,16 @@
-import os
-import io
-import time
-import random
-import subprocess
 import imaplib
-import smtplib
+import io
 import itertools
+import os
+import random
+import smtplib
+import subprocess
+import time
 from pathlib import Path
+
 import pytest
-
-from chatmaild.database import Database
 from chatmaild.config import read_config
-
+from chatmaild.database import Database
 
 conftestdir = Path(__file__).parent
 
diff --git a/cmdeploy/src/cmdeploy/tests/test_cmdeploy.py b/cmdeploy/src/cmdeploy/tests/test_cmdeploy.py
index 215a1d1..ff9c516 100644
--- a/cmdeploy/src/cmdeploy/tests/test_cmdeploy.py
+++ b/cmdeploy/src/cmdeploy/tests/test_cmdeploy.py
@@ -1,6 +1,7 @@
 import os
 
 import pytest
+
 from cmdeploy.cmdeploy import get_parser, main
 
 
diff --git a/cmdeploy/src/cmdeploy/www.py b/cmdeploy/src/cmdeploy/www.py
index 2a92133..9dd404b 100644
--- a/cmdeploy/src/cmdeploy/www.py
+++ b/cmdeploy/src/cmdeploy/www.py
@@ -1,13 +1,14 @@
-import importlib.resources
-import webbrowser
 import hashlib
+import importlib.resources
 import time
 import traceback
+import webbrowser
 
 import markdown
-from jinja2 import Template
-from .genqr import gen_qr_png_data
 from chatmaild.config import read_config
+from jinja2 import Template
+
+from .genqr import gen_qr_png_data
 
 
 def snapshot_dir_stats(somedir):
@@ -120,7 +121,8 @@ def main():
     print(f"watching {src_path} directory for changes")
 
     changenum = 0
-    for count in range(0, 1000000):
+    count = 0
+    while True:
         newstats = snapshot_dir_stats(src_path)
         if newstats == stats and count % 60 != 0:
             count += 1