for the times when you just want to send an email and you don't want to setup postfix because you don't care about the email all that much...

justsend.py

#!/usr/bin/env python

import argparse
from email import message_from_string
import smtplib
import sys


def justsend():
    parser = argparse.ArgumentParser(description="Just send and email message to a SMTP server.")  # noqa
    parser.add_argument("-a", "--address", action="store", dest="address", type=str,               # noqa
                        help="host:port of SMTP server to send email to",
                        default="127.0.0.1")
    args = parser.parse_args()

    msg = message_from_string(sys.stdin.read())
    s = smtplib.SMTP(args.address)
    to = None
    if isinstance(msg['To'], list):
        to = msg['To']
    else:
        to = [msg['To']]
    s.sendmail(msg['From'], to, msg.as_string())
    s.quit()


if __name__ == '__main__':
    justsend()