Migrating the old mailing list archives back in place will be a multi-step plan. I've copied over the archives of the mailman lists which don't have an active list.

Please check out the test-outcome here: https://mailman-test.common-lisp.net/pipermail/

Any review and comments highly appreciated. 

Please do note that the archives of active lists need to be merged, something to be addressed in a later step. The same applies to the mmjlm archives: they still have to be merged with the mailman archives. This will happen later.
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