How To Send Bulk Email Sender [python]

This is a bulk email sending script in python. It doesnt require any dependency. The email of the sender needs to be of gmail and the list of recepients emails should be in a .txt file . Each email should be on a single line else this script will not work. Plz comment and rep+ if you like it.

Code:

import smtplib
import sys

try:
    print "-----------------++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------"
    print "-----------------++++++++++++++++++++++++++++++++++++++--Asad Rafiq--++++++++++++++++++++++++++++++++++++++++++-----------------"
    print "-----------------++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------"
    
    # get the txt file containing the email addresses of recepients. Each email is written on a separate line
    # for example
    # someone@some.com
    # otherperson@other.com
    # and so on
    
    users = raw_input("\n[email sender]  recepients file name:  ")
    if ".txt" in users:
        pass
    else:
        print "[email sender]  this is not a valid txt file"
        sys.exit()

    # get the list of recepients
    recepients = []
    try:
        with open(users) as i:
            user_list = i.readlines()
        for i in user_list:
            recepients.append(i.strip("\n"))
    except IOError :
        print "[email sender]  invalid recepients file"
        sys.exit()

    # get the required information from the user
    FROM = raw_input("[email sender]  from:  ")
    TO = recepients 
    SUBJECT = raw_input("[email sender]  subject:  ")
    TEXT = raw_input("[email sender]  message:  ")



    # Prepare actual message
    headers = ["From: " + FROM,
               "Subject: " + SUBJECT,
               "To: " + ", ".join(TO),
               "MIME-Version: 1.0",
               "Content-Type: text/html"]
    headers = "\r\n".join(headers)
    body = "" + TEXT + ""
    
    # Credentials 
    username = raw_input("[email sender]  your gmail username:  ")
    password = raw_input("[email sender]  your gmail password:  ")

    # The actual mail send
    print "[email sender]  sending....."
    server = smtplib.SMTP('smtp.gmail.com:587')
    server.starttls()
    server.login(username,password)
    server.sendmail(FROM, TO, headers + "\r\n\r\n" + TEXT)
    server.quit()
    print "[email sender]  email sent to all recepients"
except KeyboardInterrupt :
    print "\n[email sender]  program was closed by the user\n"