In a test context, the special list is not required

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

smtp_test_server/context.py

@@ -2,12 +2,11 @@
 Pytest Mock SMTP Server for testing
 """
 from email.message import Message as EmailMessage
-from typing import Optional
+from typing import List, Optional
 
 from aiosmtpd.handlers import Message
 
 from smtp_test_server.exceptions import AlreadyStartedError, NotProperlyInitializedError, NotStartedError
-from smtp_test_server.list import ThreadSafeMailList
 from smtp_test_server.mock import SmtpController
 from smtp_test_server.net import find_free_port
 
@@ -22,7 +21,7 @@ class MessageKeeper(Message):
         Initialize with an empty message list
         """
         super().__init__(*args, **kwargs)
-        self.__messages: ThreadSafeMailList[EmailMessage] = ThreadSafeMailList()
+        self.__messages: List[EmailMessage] = []
 
     def handle_message(self, message: EmailMessage) -> None:
         """
@@ -31,7 +30,7 @@ class MessageKeeper(Message):
         self.__messages.append(message)
 
     @property
-    def messages(self) -> ThreadSafeMailList[EmailMessage]:
+    def messages(self) -> List[EmailMessage]:
         """
         Access the messages list
         """
@@ -93,7 +92,7 @@ class SmtpMockServer:
         return self.__bind_port
 
     @property
-    def messages(self) -> ThreadSafeMailList[EmailMessage]:
+    def messages(self) -> List[EmailMessage]:
         """
         Access the messages
         """

smtp_test_server/list.py

@@ -1,32 +0,0 @@
-"""
-Implementation of a thread safe list for mails
-"""
-import threading
-from typing import TypeVar
-
-T = TypeVar("T")
-
-
-class ThreadSafeMailList(list[T]):
-    """
-    Simplified Mail List
-    """
-
-    def __init__(self, *args, **kwargs):
-        """
-        List with locking
-        """
-        super().__init__(*args, **kwargs)
-        self.__lock = threading.Lock()
-
-    def append(self, __object: T):
-        with self.__lock:
-            super().append(__object)
-
-    def __len__(self) -> int:
-        with self.__lock:
-            return super().__len__()
-
-    def __getitem__(self, item) -> T:
-        with self.__lock:
-            return super().__getitem__(item)