| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an electronic mail system and an unsolicited mail discriminating method in the electronic mail system, wherein unsolicited mail can be discriminated efficiently without requiring many hardware resources. <P>SOLUTION: A transmission permission list is set and stored in a mail sender server 13 connected to a first network 100, and further, a reverse DNS (Domain Name System) lookup function is included. Then, when electronic mail is received in a mail receiving server 22 provided in a second network 200, a mail address and a domain name corresponding to an IP address, which becomes a transmission source of the electronic mail, are retrieved by an inquiry to the mail sender server 13, and are compared with a mail address and a domain name of the received electronic mail. Then, when the compared mail addresses or domain names do not match, the electronic mail is determined as unsolicited mail. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
