Why does OpenSuSE mailing-list are on ezmlm?

I know this is not exactly the right place to ask this question, but among the available mailing-lists it is the closest to the subject. OpenSuSE mailing-list are managed by ezmlm. This is a strange choice considering: 1. There is no ezmlm RPM package in OpenSuSE. It is a bit odd that a distribution uses a software on its servers that it does not even distribute... 2. Mailman has many more features and has a RPM package in OpenSuSE. Why then ezmlm?! Mark