help using smtplib to work ..

[NicolasG]

I'm using the following code to send e-mail through python:

import smtplib

fromaddr = 'myMail at gmail.com'
toaddrs  = 'myOtherMail at gmail.com'
subject = 'someting for subject !'

msg = 'This is body of the mail.'

msg = 'From: ' + fromaddr + '\nTo: ' + toaddrs + '\nSubject:' + subject
+ '\n\n' + msg
print "Message length is " + repr(len(msg))

server = smtplib.SMTP('smtp.gmail.com')
server.set_debuglevel(1)
server.sendmail(fromaddr, toaddrs, msg)
server.quit()

I have replaced the sender and receiver's mail address with the
original ones but executing this code I get the error (ip is hided for
obvious reason):

send: 'ehlo computer.domain_not_set.invalid\r\n'
reply: '250-mx.google.com at your service, [xxx.xx.xxx.xxx]\r\n'
reply: '250-SIZE 20971520\r\n'
reply: '250-8BITMIME\r\n'
reply: '250-STARTTLS\r\n'
reply: '250 ENHANCEDSTATUSCODES\r\n'
reply: retcode (250); Msg: mx.google.com at your service,
[xxx.xx.xxx.xxx]
SIZE 20971520
8BITMIME
STARTTLS
ENHANCEDSTATUSCODES
send: 'mail FROM:<myMail at gmail.com> size=106\r\n'
reply: '530 5.7.0 Must issue a STARTTLS command first
s1sm7666914uge\r\n'
reply: retcode (530); Msg: 5.7.0 Must issue a STARTTLS command first
s1sm7666914uge
send: 'rset\r\n'
reply: '250 2.1.0 Flushed s1sm7666914uge\r\n'
reply: retcode (250); Msg: 2.1.0 Flushed s1sm7666914uge
Traceback (most recent call last):
  File "C:\Documents and Settings\NicolasG\Desktop\smtpexample.py",
line 17, in <module>
    server.sendmail(fromaddr, toaddrs, msg)
  File "C:\Python25\lib\smtplib.py", line 684, in sendmail
    raise SMTPSenderRefused(code, resp, from_addr)
SMTPSenderRefused: (530, '5.7.0 Must issue a STARTTLS command first
s1sm7666914uge', 'myMail at gmail.com')

What am I doing wrong ?