[Mailman-Users] Install Problem - Exim - Child Process Error

[Marc Perkel]

This is the error I'm getting. Running Redhat 7.2.

What am I doing wrong?

pipe to |/var/mailman/mail/wrapper post testmailman
    generated by testmailman at eff.org
    Child process of address_pipe transport returned 2 from command:
    /var/mailman/mail/wrapper