E-MAIL RECEIVING DEVICE, NETWORK SERVER, AND EXPIRATION MANAGEMENT METHOD FOR RECEIVED E-MAIL

摘要

A mail receiver includes: a mail receiving unit that receives a mail towhich an attached file and a reference time limit of the attached file areappended; a monitoring unit that monitors whether the attached file wasreferred to by a user; and a warning unit that warns the user of one whichthe reference time limit is approaching among a non-referenced attachedfile.Therefore it can manage time limits regarding a received mail morecertainly.