Simple Python SMTP client

smtpcli.py

#
# Minimal SMTP client
# Supports setting of TO, FROM, SUBJECT
#  (multiple TOs must be separated by commas)
# Reads body from stdin
#

import smtplib
import os
import sys

msg = ("From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n" % (os.environ['FROM'], os.environ['TO'], os.environ['SUBJECT']))

server = smtplib.SMTP(os.environ['SMTP'])
#server.set_debuglevel(1)
server.sendmail(os.environ['FROM'], os.environ['TO'].split(','), msg + sys.stdin.read())
server.quit()