The RPM I'm referring to that was on smedev was smeserver-mailman-1.3.0-15.el4.sme.noarch.rpm, which is one rev. newer than the one at the above link. I can't remember how to use the rpm command to reveal the changelog so as to see what changed.
I've added a mailman page on the smeserver wiki:
http://wiki.contribs.org/Mailman to start collecting knowledge on installing, using and maintaining mailman. Feel free to update.
Thanks all.