SMTP question

[LutherRevisited]

I'm trying to send an email this way:
msg = MIMEText(self.text_ctrl_1.GetValue())
        msg['Subject'] = sub
        msg['From'] = 'bossierbossman at yahoo.com'
        msg['To'] = to
        s = smtplib.SMTP('smtp.mail.yahoo.com')
        s.set_debuglevel(1)
        s.connect()
        s.sendmail('bossierbossman at yahoo.com', to, msg)
        s.quit()
but this is not working at all.  Can someone point me in the right direction?