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.
rpmconf is a tool that searches for .rpmnew and .rpmsave files and asks you what to do with them. You can choose to keep the current version, place back the old version, or view the difference between the two before deciding.