Various embodiments are disclosed for processing image cash letter files comprising transactions directed to a first image exchange system and transactions directed to a second image exchange systems. First and second cash letter output files may be generated, where the first and second cash letter output files may comprise cash letter file headers based on a header of an input cash letter file. Each transaction record included in the input cash letter file may be directed to either the first output cash letter file or the second output cash letter file. The headers of the respective output cash letter files may be updated based on the records written thereto.