Mailman archives migration

We are migration from another hosting to DreamHost.

The site has been created and I would like to import my previous discussion mailing lists.

I went to the DreamHost panel and created the mailing lists, migration of subscribers is easy it’s just slow because I do it by hande for each list (we are moving from a dedicated hosting so I can ssh into the old hosting and run list_lists, list_members, et… and mass subscribe users on DreamHost mailing lists).

What about mailing lists archives? I don’t know how to import them.
Can you help me?

I have archives in .mbox format.