Removed unused imports and fixed indentation

tests/alias_test.py

@@ -4,9 +4,6 @@ import time
 import sys
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
-import ntpath
-from email.mime.base import MIMEBase
-from email import encoders
 
 msg = MIMEMultipart()
 msg['From'] = "admin@mailu.io"
@@ -52,7 +49,7 @@ for user in ['user@mailu.io', 'admin@mailu.io', 'user/with/slash@mailu.io']:
 
     typ, data = imap_server.search(None, 'ALL')
     for num in data[0].split():
-       imap_server.store(num, '+FLAGS', '\\Deleted')
+        imap_server.store(num, '+FLAGS', '\\Deleted')
     imap_server.expunge()
 
     imap_server.close()