>> 2. If #1 is true, then why do I get a command not found error when I issue >> redhat-switchmail-nox? > Perhaps because the command is redhat-switch-mail-nox? Actually, I just installed redhat-switchmail-0.5.14-1.noarch.rpm cd / redhat-switchmail-nox And it brought up the MTA switcher just fine! I knew I had seen the command that way previously.