CHAPTER ONE

INTRODUCTION

An electronic mail system comprising: a mail server having a mail sender which is connected to a first communication network including a data communication network and which receives an electronic mail and sends the received electronic mail to a relevant client; a client having a mail receiver for receiving the electronic mail sent from the mail sender; and a second communication network including a wireless transmission path, for connecting the mail server and the client, wherein: the mail sender comprises: a first mail receiving unit for receiving mail data of each electronic mail sent via the first communication network, a storage device for storing the mail data received by the first mail receiving unit in turn; a mail sending unit for reading out the mail data stored in the storage device, and sending the readout mail data to the second communication network; a command interpreting section for receiving and interpreting a command, generated by the client, sent via the second communication network, and outputting a signal ordering rearranging the mail data stored in the storage device in response to receipt of said command; and a mail order rearranging section for rearranging the order of the mail data stored in the storage device, based on the signal sent from the command interpreting section, and the mail receiver comprises: a second mail receiving unit for receiving a wireless signal corresponding to the readout mail data from the second communication network, and demodulating and storing the mail data from the received wireless signal, and monitoring the received wireless signal of the mail data so as to detect a change of a receiving condition of the received wireless signal and output a detection signal, said receiving condition corresponding to an intensity of the received wireless signal; a receiving conditio

monitoring section for receiving the detection signal indicating a change of the receiving condition from the second mail receiving unit, and, in response thereto, outputting a signal ordering the issue of said command; and a command issuing section for sending said command according to the output from the receiving condition monitoring section to the second communication network. 2. An electronic mail system as claimed in claim 1, wherein the second mail receiving unit comprises a radio wave monitoring section for detecting and outputting the intensity of the received radio wave of the wireless signal at predetermined intervals, and generates the detection signal indicating a change of the receiving condition based on the output from the radio wave monitoring section.

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