diff --git a/DEVNOTES.md b/DEVNOTES.md
index 465fb0c..56099dd 100644
--- a/DEVNOTES.md
+++ b/DEVNOTES.md
@@ -1,3 +1,4 @@
+Notes for developers
 
 ## Running just one test
 
@@ -8,10 +9,13 @@ python -m unittest tests.test_pop.TestPop3.test_CAPA
 ## Patch for enable logging in test
 
 Patch generated using below
+
 ```
 git diff --patch -U1 tests >> ./DEVNOTES.md
 ```
 
+Apply with below
+
 ```bash
 git apply - <<PATCH
 diff --git a/tests/test_pop.py b/tests/test_pop.py
@@ -25,3 +29,10 @@ index 55c1a91..a825665 100644
      td = tempfile.TemporaryDirectory(prefix="m41.pop.")
 PATCH
 ```
+
+## pylint
+
+```
+pylint mail4one/*py > /tmp/errs
+vim +"cfile /tmp/errs"
+```
diff --git a/mail4one/pop3.py b/mail4one/pop3.py
index 22e0aef..9f56854 100644
--- a/mail4one/pop3.py
+++ b/mail4one/pop3.py
@@ -298,7 +298,7 @@ async def transaction_stage() -> None:
             deleted_items_path, existing_deleted_items.union(new_deleted_items)
         )
 
-    logger.info(f"Saved deleted items")
+    logger.info("Saved deleted items")
 
 
 async def start_session() -> None:
@@ -341,7 +341,7 @@ def make_pop_server_callback(mails_path: Path, users: list[User], timeout_second
         c_shared_state.set(s_state)
         ip, _ = writer.get_extra_info("peername")
         c_state.set(State(reader=reader, writer=writer, ip=ip, req_id=s_state.next_id()))
-        logger.info(f"Got pop server callback")
+        logger.info("Got pop server callback")
         try:
             try:
                 return await asyncio.wait_for(start_session(), timeout_seconds)
@@ -363,7 +363,7 @@ async def create_pop_server(
     timeout_seconds: int = 60,
 ) -> asyncio.Server:
     logging.info(
-        f"Starting POP3 server {host=}, {port=}, {mails_path=!s}, {len(users)=}, {ssl_context != None=}, {timeout_seconds=}"
+        f"Starting POP3 server {host=}, {port=}, {mails_path=!s}, {len(users)=}, {bool(ssl_context)=}, {timeout_seconds=}"
     )
     return await asyncio.start_server(
         make_pop_server_callback(mails_path, users, timeout_seconds),
diff --git a/mail4one/smtp.py b/mail4one/smtp.py
index c45917e..fa0a557 100644
--- a/mail4one/smtp.py
+++ b/mail4one/smtp.py
@@ -34,7 +34,7 @@ class MyHandler(AsyncMessage):
         self.peer = session.peer
         return await super().handle_DATA(server, session, envelope)
 
-    async def handle_message(self, m: Message):  # type: ignore[override]
+    async def handle_message(self, message: Message):  # type: ignore[override]
         all_mboxes: set[str] = set()
         for addr in self.rcpt_tos:
             for mbox in self.mbox_finder(addr.lower()):
@@ -51,7 +51,7 @@ class MyHandler(AsyncMessage):
             temp_email_path = Path(tmpdir) / filename
             with open(temp_email_path, "wb") as fp:
                 gen = BytesGenerator(fp, policy=email.policy.SMTP)
-                gen.flatten(m)
+                gen.flatten(message)
             for mbox in all_mboxes:
                 shutil.copy(temp_email_path, self.mails_path / mbox / "new")
             logger.info(
@@ -104,7 +104,7 @@ async def create_smtp_server_starttls(
     smtputf8: bool,
 ) -> asyncio.Server:
     logging.info(
-        f"Starting SMTP STARTTLS server {host=}, {port=}, {mails_path=!s}, {ssl_context != None=}"
+        f"Starting SMTP STARTTLS server {host=}, {port=}, {mails_path=!s}, {bool(ssl_context)=}"
     )
     loop = asyncio.get_event_loop()
     return await loop.create_server(
@@ -131,7 +131,7 @@ async def create_smtp_server(
     smtputf8: bool,
 ) -> asyncio.Server:
     logging.info(
-        f"Starting SMTP server {host=}, {port=}, {mails_path=!s}, {ssl_context != None=}"
+        f"Starting SMTP server {host=}, {port=}, {mails_path=!s}, {bool(ssl_context)=}"
     )
     loop = asyncio.get_event_loop()
     return await loop.create_server(