You can reopen the document you saved and resume your delivery from it.
MaxBulk Mailer doesn't reselect a list because that list may have changed. A document is supposed to remain as it is saved. What if you open a document several months later to see delivery statuses? It would be a great failure if MaxBulk Mailer were showing the list at it is today rather than as it was when saving the document.
A solution to your problem would be to use the Quick Selector ( Recipients > Quick Selector) and search for the last delivery date. The example attached would deactivate all the recipients that have received an email from you before or on february 10, 2012
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