I personally think that mailing lists are a welcome extension on ISPConfig. Many organisations need them I think. Many ISPs are also offering mailing lists, so why not ISPConfig? For the rest I really love ISPCOnfig. It completely gives all the tools I need to host all different the websites on a virtual machine for our organisation, except the mailing lists.
mlmmj / ezmlm gplhost use mlmmj to maintain mailinglist inside their control panel. I hope ispconfig developers or other can create package from it or if qmail available as ispconfig MTA than ezmlm can be maintained using qmailadmin via vpopmail. cheers ________ Marijuana vaporizer