1. A workflow server comprising: an interface configured to receive print data defining a print job that includes documents that each comprise a mail piece having an intended recipient for delivery, wherein there are multiple recipients indicated by the documents of the print job; and a controller configured to direct devices of a print shop in accordance with a workflow that comprises an ordered set of activities to perform upon the documents, and the activities comprise operations performed by a printer or post-printing device for physically printed versions of the documents; wherein the controller is configured to acquire preferences for the intended recipients, to correlate documents in the print job with the acquired preferences, and to alter processing of the correlated documents in the workflow by selectively skipping activities in the workflow for the correlated documents, based on the preferences of the intended recipients.
4. The workflow server of claim 1 wherein: the workflow includes multiple branches that each define a different set of activities, and the controller is configured to alter the processing of the correlated documents by changing the branch through which the correlated documents of the print job are routed, based on the preferences of the intended recipients.