diff --git a/.gitignore b/.gitignore
index 8e21425..381b24b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -72,3 +72,4 @@ config-dev.ini
 .python-version
 stacosys.sublime-project
 stacosys.sublime-workspace
+out/
\ No newline at end of file
diff --git a/src/stacosys/i18n/messages.py b/src/stacosys/i18n/messages.py
index d64cbac..a92113a 100644
--- a/src/stacosys/i18n/messages.py
+++ b/src/stacosys/i18n/messages.py
@@ -8,9 +8,11 @@ class Messages:
 
     def load_messages(self, lang):
         config = configparser.ConfigParser()
-        config.read(os.path.join(os.path.dirname(__file__), 'messages_' + lang + '.properties'))
+        config.read(
+            os.path.join(os.path.dirname(__file__), "messages_" + lang + ".properties")
+        )
 
-        for key, value in config.items('messages'):
+        for key, value in config.items("messages"):
             self.property_dict[key] = value
 
     def get(self, key):
diff --git a/src/stacosys/model/email.py b/src/stacosys/model/email.py
deleted file mode 100644
index fad2336..0000000
--- a/src/stacosys/model/email.py
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: UTF-8 -*-
-
-from dataclasses import dataclass
-from datetime import datetime
-from typing import List
-
-
-@dataclass
-class Part:
-    content: str
-    content_type: str
-
-
-@dataclass
-class Attachment:
-    filename: str
-    content: str
-    content_type: str
-
-
-@dataclass
-class Email:
-    id: int
-    encoding: str
-    date: datetime
-    from_addr: str
-    to_addr: str
-    subject: str
-    parts: List[Part]
-    attachments: List[Attachment]
-    plain_text_content: str
diff --git a/src/stacosys/run.py b/src/stacosys/run.py
index 255c424..42d903c 100644
--- a/src/stacosys/run.py
+++ b/src/stacosys/run.py
@@ -101,5 +101,5 @@ if __name__ == "__main__":
     try:
         main(args.config)
     except Exception as e:
-        logging.error(f"Failed to start application: {e}")
+        logging.error("Failed to start application: %s", e)
         sys.exit(1)