You might want to take a look at fetchmail.

Its original intent was to download mail from a server w/ a dialup connection, and move it to a local server. You might be able to make use of it to pull down all of the data to mbox files, and transfer those over.

In reply to [OT] Re: Sneaker net between mail servers with MailTools? by jhourcle
in thread Sneaker net between mail servers with MailTools? by Plankton

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