send email and not use smtplib and email

sendmail.py

#!/usr/local/bin/python
# -*- coding:utf-8 -*-

import os
SENDMAIL_LOCATION = "/var/qmail/bin/sendmail"


def send(sender, receivers, subject, body, encoding):
    p = os.popen("%s -t" % SENDMAIL_LOCATION, "w")
    p.write("From: %s\n" % sender)
    p.write("Reply-to: %s\n" % sender)
    p.write("To: %s\n" % ','.join(receivers))
    p.write("Content-type: text/html\n")
    p.write("Subject: %s\n" % subject.encode(encoding))
    p.write("\n")
    p.write(body.encode(encoding))
    p.close()

if __name__ == '__main__':
    sender = 'from@xxxx'
    receivers = ['to@xxxx']
    subject = u'テスト件名'
    body = u'テスト本文'
    encoding = 'utf-8'

    send(sender, receivers, subject, body, encoding)