Given this bug that's on the roadmap for ISPConfig 3.0.5, it may be preferable to wait until 3.0.5 is released before throwing additional effort at this:
http://bugtracker.ispconfig.org/inde...1922&project=3
If I find time tomorrow, though, I'll see if I can investigate further. It sounds like your issue is different from that mentioned in the bug report, but it seems less than ideal to make Mailman available in a production capacity before the aforementioned issue is resolved.
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