How can I send email using Python?

If message headers, payload contain non-ascii characters then they should be encoded:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from email.header    import Header
from email.mime.text import MIMEText
from getpass         import getpass
from smtplib         import SMTP_SSL


login, password = '[email protected]', getpass('Gmail password:')
recipients = [login]

# create message
msg = MIMEText('message body…', 'plain', 'utf-8')
msg['Subject'] = Header('subject…', 'utf-8')
msg['From'] = login
msg['To'] = ", ".join(recipients)

# send it via gmail
s = SMTP_SSL('smtp.gmail.com', 465, timeout=10)
s.set_debuglevel(1)
try:
    s.login(login, password)
    s.sendmail(msg['From'], recipients, msg.as_string())
finally:
    s.quit()

If you print the error message, you will likely get a comprehensive description of what error occurred. Try (no pun intended) this:

try:
    # ...
except Exception, error:
    print "Unable to send e-mail: '%s'." % str(error)

If, after reading the error message, you still do not understand your error, please update your question with the error message and we can help you some more.

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Update after additional information:

the error message

socket.error: [Errno 111] Connection refused

means the remote end (e.g. the GMail SMTP server) is refusing the network connection. If you take a look at the smtplib.SMTP constructor, it seems you should change

server = smtplib.SMTP('smtp.gmail.com:587')

to the following.

server = smtplib.SMTP(host='smtp.gmail.com', port=587)