diff --git a/backup_imap/backup_imap.py b/backup_imap/backup_imap.py
index 3f65664..25f7137 100644
--- a/backup_imap/backup_imap.py
+++ b/backup_imap/backup_imap.py
@@ -14,8 +14,6 @@ import logging
 from logging.handlers import SysLogHandler
 import imaplib
 import email
-from email.mime.multipart import MIMEMultipart
-from email.mime.text import MIMEText
 import click
 import click_config_file
 
@@ -144,7 +142,19 @@ class BackupImap:
                     data = fetch_data[0][1]
                     subjects = self._get_mail_header('Subject', data)
                     if len(subjects) > 0:
-                        subject = subjects[-1].replace(os.path.sep, '_').replace('\r', '_').replace('\n', '_').replace(':', '_')
+                        subject = subjects[-1].replace(
+                            os.path.sep,
+                            '_'
+                        ).replace(
+                            '\r',
+                            '_'
+                        ).replace(
+                            '\n',
+                            '_'
+                        ).replace(
+                            ':',
+                            '_'
+                        )
                     message_path = os.path.join(
                         mailbox_path,
                         subject