The agency beat OgilvyOne and TMW to the business in the final round.
Draft will now be briefed with developing and exploiting the Post Office's consumer database in order to optimise customer value, as the business attempts to reposition itself from a product-focused organisation to a customer-centric one.
The brief will have a particular emphasis on direct mail, press and digital but will also include strategy related services such as design, positioning and insight.
The account came up for pitch in February with the Post Office putting together a shortlist of 12 agencies in July before cutting to the final three in late October.
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