He estado intentando que mi aplicación envíe un mensaje de texto enviado a un correo electrónico. Para simplificar, he aislado el script:

import smtplib
import sys
import os

SERVER = "localhost"

FROM = os.getlogin()
TO = [raw_input("To : ")]

SUBJECT = "Message From " + os.getlogin()

print "Message : (End with ^D)"
TEXT = ''
while 1:
    line = sys.stdin.readline()
    if not line:
        break
    TEXT = TEXT + line

# Prepare actual message

message = """\
From: %s
To: %s
Subject: %s

%s
""" % (FROM, ", ".join(TO), SUBJECT, TEXT)

# Send the mail

server = smtplib.SMTP(SERVER)
server.sendmail(FROM, TO, message)
server.quit()

Este script genera:

    Traceback (most recent call last):
  File "/Users/christianlaustsen/Dropbox/Apps - Python/mail/smtplib_mail.py", line 32, in <module>
    server = smtplib.SMTP(SERVER)
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/smtplib.py", line 239, in __init__
    (code, msg) = self.connect(host, port)
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/smtplib.py", line 295, in connect
    self.sock = self._get_socket(host, port, self.timeout)
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/smtplib.py", line 273, in _get_socket
    return socket.create_connection((port, host), timeout)
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/socket.py", line 512, in create_connection
    raise error, msg
error: [Errno 61] Connection refused

Así como puedes ver, la conexión se rechaza. Estoy ejecutando Python 2.6 en Mac OS X Snow Leopard (si es relevante).

He intentado buscar mucho, pero no he podido encontrar una solución. Cualquier ayuda será apreciada.