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Spam mail blocking method by country selection

IP.com Disclosure Number: IPCOM000178073D
Original Publication Date: 2009-Jan-15
Included in the Prior Art Database: 2009-Jan-15
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Abstract

Disclosed is a method for blocking the spam mail. Recently, the number of spam mails is getting large and it is causing serious social problems. This article shows a method for deleting spam mails automatically.

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Spam mail blocking method by country selection

Disclosed is a method for blocking the spam mail. Recently, the number of spam mails is getting large and it is causing serious social problems. This article shows a method for deleting spam mails automatically.

Every e-mail has a mail header. In this mail header, there are one or multiple "Received:" lines. The "Received:" line is added by each mail server which received or relayed this mail, and it includes the server name and IP address of the server machine. Because every IP address is uniquely assigned by IANA(Internet Assigned Number Authority), we can know the provider name and country name of the mail server, by referring the assignment list created by IANA. We can get this assignment list from "ftp.apnic.net", etc...

By this logic, we can recognize the country name where each e-mail is sent from, easily.

By the way, according to the SOPHOS's report(*1), most of spam mails are sent from innocent third party computers which have been hijacked by spammers. Accordingly, spam mails are sent from various countries.

The top twelve countries responsible for relaying spam across the globe between April-June 2008 is as follows:
1 United States 14.9%
2 Russia 7.5%
3 Turkey 6.8%
4 China (incl HK) 5.6%
5 Brazil 4.5%
6 Poland 3.6%
6 Italy 3.6%
7 South Korea 3.5%
8 United Kingdom 3.2%
8 Spain 3.2%
9 Germa...