This contrib has not been ported since sme7.
Try to install it following the wiki and downloading the rpm manually from obsolete in our mirrors.
Will be pleased to help you walk trought, update the wiki, and fix what need to be fixed if you give a try.
The opt dir should be populated by the smeserver-ezmlm-www and ezmlm-www packages.
Ezmlm-web is the package to configure the ezmlm lists with web interface
Ezmlm-www is for consulting the archive with web interface.