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 to which an attached file and a reference time limit of the attached file are appended; a monitoring unit that monitors whether the attached file was referred to by a user; and a warning unit that warns the user of one which the reference time limit is approaching among a non-referenced attached file.;Therefore it can manage time limits regarding a received mail more certainly.