upgrade_mailer.py is a script that sends email or Jabber notifications when updates on your APT or YUM based system are available. This includes Debian, Ubuntu, Fedora, CentOS, and Red Hat. It can use TLS if your SMTP supports that.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.