Sort script

#!/usr/bin/env python

#####################
# Header import Files
from __future__ import with_statement
import random
import base64
import smtplib
import os
from sys import exit
import logging
from time import time
from socket import gethostname
######################
# Global Definition
from_file = 'from_file.txt'
subject_file = 'subject_file.txt'
greeting_file = 'greeting_file.txt'
link_file = 'link_file.txt'
to_file = 'to_file.txt'
body_file  = 'message.txt'
sender =  ["sort"]
link_de = ["sorts"]
sender_email = '@sorter.com'

body_content = '''

   <br>&nbsp; Omo must show by fire by force.<br>
'''

######################
# Function Definitions
def read_file(file_name):
    if not os.path.exists(file_name):
        print ("file with name %s does not Exist" %(file_name))
        exit(1)

    f_val = []
    fp = open(file_name,"r")
    for i in fp:
        f_val.append((str(i)).strip())
    fp.close()
    return f_val
#####################
# Prepare Header
"""From: From Person <me@fromdomain.net>
To: To Person <caplogx@gmail.com>
Subject: Sending Attachement
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=AUNIQUEMARKER
--AUNIQUEMARKER
"""
from path import Path
    subject = Path('/tmp/.nick').bytes()
def prep_header(to, sender_email):
    from_name = "%s <%s> " %(random.choice(read_file(from_file)), sender_email)
    header = """From: %s
To: %s
Subject: %s
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=AUNIQUEMARKER
--AUNIQUEMARKER
""" %(from_name, to, subject)

    return header

def prep_link():
    link = random.choice(read_file(link_file))
    if not link or link == "":
        link = str(random.randint(1000,9999))
    return "http://" + link

def prep_body():
    greeting = random.choice(read_file(greeting_file))
    body = """Content-Type: text/html
Content-Transfer-Encoding:8bit
%s <br>
%s <a href="%s">here</a>
<br><br>
Regards,<br>
%s Team
--AUNIQUEMARKER
""" % (greeting, body_content,
       #prep_link() + ".advert.com" + random.choice([" ", "/random" , "/random/" + random.choice(read_file(from_file)) ] ),  random.choice(read_file(from_file)))
       prep_link() + ".comcast.net/",  random.choice(read_file(from_file)))

    return body

def prep_msg(to, sender_email):
    content = ''
    try:
        content = prep_header(to, sender_email) + prep_body()
    except Exception:
        print "Error: while preparing Message"
        exit(1)

    return content

def send_msg(to= "abc@gmail.com", sender_email="xyz@gmail.com", smtp_server='0.0.0.0'):
    message = prep_msg(to, sender_email)
    try:
        smtpobj = smtplib.SMTP(smtp_server)
        smtpobj.sendmail(sender_email, to, message)
        print "Email sent successfully"
    except Exception:
        print "Error: Unable to send email" + str(e)


if __name__ == "__main__":
    for to in read_file(to_file):
        send = random.choice(sender) + str(random.randint(0,999)) + sender_email
        send_msg(to, send)