Despite the world moving digital, having letters or physical copies of contracts, transcripts, IDs, etc., especially for official and legally-binding documents, remains important. 

Hence, the demand to process enveloped paper documents remains steady, keeping CEP and other logistics players on their toes and making specialised material-handling devices such as letter sorters imperative in the age of quick delivery. 

What differentiates letter sorting machines from standard parcel sorters is that the loads here, mostly comprising paper, are aptly lightweight and paper-thin. Thus, they must be handled in a compact space, where high-speed sorting can be performed.