Post Commit Hook with Email Notification Error SVN - email

Question

I am configuring my SVN server to send an email when some one commit code to the repository. After some googling I am using bellow codes for post-commit. I would like to use gmail SMTP as a mail server. But I am ending up with error..
"post-commit hook failed (exit code 255) with no output."
My Configuration Files:
post-commit
REPOS="$1"
REV="$2"
/SVNData/testrepo/hooks/mailer.py commit "$REPOS" \
"$REV" /SVNData/testrepo/hooks/mailer.conf
mailer.py Additional Config
def finish(self):
server = smtplib.SMTP(self.cfg.general.smtp_hostname)
if self.cfg.is_set('general.smtp_use_ssl') and self.cfg.general.smtp_use_ssl.lower() == "true":
server.ehlo()
server.starttls()
server.ehlo()
if self.cfg.is_set('general.smtp_username'):
server.login(self.cfg.general.smtp_username,
self.cfg.general.smtp_password)
server.sendmail(self.from_addr, self.to_addrs, self.buffer.getvalue())
server.quit()
mailer.conf
[general]
smtp_hostname = smtp.gmail.com:587
smtp_username = mysvnemail.test2015#gmail.com
smtp_password = MyPassword+12345
smtp_use_ssl = true
smtp_use_tls = 1
from_addr = svnadmin#myoffice.net
to_addr = myemail#myoffice.com
reply_to = info#myoffice.net
When I commit a file from SVN client I am not getting any email and I am getting the error as..
post-commit hook failed (exit code 255) with no output.