Problem occured while sending mail

[sui]

this is my code

import sys, os, glob, datetime, time
import smtplib
## Parameters for SMTP session
port=587
SMTPserver=  'smtp.gmail.com'
SMTPuser= '... at gmail.com'
pw= 'fill in here'
SENDER= SMTPuser

## Message details
FROM=  SENDER
TO= 'notgm... at a.com'
CC=FROM
##RECEIVERS= (TO, CC)  ##proper way to send to both TO and CC
RECEIVERS= (TO,)  ## ignore the CC address

subject= 'Test 1a'
message='*** Email test  *** '

print 'Starting SMTP mail session on %s as  %s ' %
(SMTPserver,SMTPuser)
session = smtplib.SMTP(SMTPserver,port)
session.set_debuglevel(0)  # set debug level to 1 to see details
session.ehlo(SMTPuser)  # say hello
session.starttls()  # TLS needed
session.ehlo(SMTPuser)  # say hello again, not sure why
session.login(SMTPuser, pw)

##Create HEADER + MESSAGE
HEADER= 'From: %s\r\n' % FROM
HEADER= HEADER + 'To: %s\r\n' % TO
HEADER= HEADER + 'Cc: %s\r\n' % CC
HEADER= HEADER + 'Subject: %s\r\n' % subject
BODY= HEADER + '\r\n' + message
print BODY

SMTPresult = session.sendmail(SENDER, RECEIVERS, BODY)  ## send email

session.close()

Now when i run this .py file...as python mail.py
i can see only statement
starting smtp mail......n details
then nothing on screen after few minutes or after pressing ctrl +c
Traceback (most recent call last):
  File "mail4.py", line 21, in <module>
    session = smtplib.SMTP(SMTPserver,port)
  File "/usr/local/lib/python2.5/smtplib.py", line 244, in __init__
    (code, msg) = self.connect(host, port)
  File "/usr/local/lib/python2.5/smtplib.py", line 301, in connect
    self.sock.connect(sa)
  File "<string>", line 1, in connect
or may be conncetion time out

wats the solution for this