diff --git a/chatmaild/src/chatmaild/dictproxy.py b/chatmaild/src/chatmaild/dictproxy.py
index 522a8cf1..f1299eb9 100644
--- a/chatmaild/src/chatmaild/dictproxy.py
+++ b/chatmaild/src/chatmaild/dictproxy.py
@@ -1,10 +1,6 @@
 import logging
 import os
-from socketserver import (
-    StreamRequestHandler,
-    ThreadingMixIn,
-    UnixStreamServer,
-)
+from socketserver import StreamRequestHandler, ThreadingUnixStreamServer
 
 
 class DictProxy:
@@ -86,12 +82,8 @@ class DictProxy:
         except FileNotFoundError:
             pass
 
-        with ThreadedUnixStreamServer(socket, Handler) as server:
+        with ThreadingUnixStreamServer(socket, Handler) as server:
             try:
                 server.serve_forever()
             except KeyboardInterrupt:
                 pass
-
-
-class ThreadedUnixStreamServer(ThreadingMixIn, UnixStreamServer):
-    request_queue_size = 100
diff --git a/chatmaild/src/chatmaild/tests/test_doveauth.py b/chatmaild/src/chatmaild/tests/test_doveauth.py
index 9b12d1d5..702b2133 100644
--- a/chatmaild/src/chatmaild/tests/test_doveauth.py
+++ b/chatmaild/src/chatmaild/tests/test_doveauth.py
@@ -129,7 +129,7 @@ def test_handle_dovecot_protocol_hello_is_skipped(db, example_config, caplog):
     assert not caplog.messages
 
 
-def test_handle_dovecot_protocol(db, example_config):
+def test_handle_dovecot_protocol_user_not_exists(db, example_config):
     dictproxy = AuthDictProxy(db=db, config=example_config)
     rfile = io.BytesIO(
         b"H3\t2\t0\t\tauth\nLshared/userdb/foobar@chat.example.org\tfoobar@chat.example.org\n"