Browse Prior Art Database

Anti Spam Email Technique

IP.com Disclosure Number: IPCOM000146956D
Original Publication Date: 2007-Feb-28
Included in the Prior Art Database: 2007-Feb-28
Document File: 1 page(s) / 20K

Publishing Venue

IBM

Abstract

Email lists that spammers use have value proportional to the validity of the email address. If the Spam mail is being received by a live user, a potential customer, it could have more value than being sent to a server where it is never delivered.

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Anti Spam Email Technique

Spam is a pervasive problem. Email lists that spammers use have value proportional to the validity of the email address. If the Spam mail is being received by a live user, a potential customer, it has more value than being sent to a server where it is never delivered. One may deny the utility of email lists, or reduce the effectiveness of email lists used by spammers by denying them validation of the target audience. The technique is to allow the user at the mail client or the email server to categorize the received email using a Spam classifier and then to reply to a Spam email using an SMTP 505 error. For example an email sent to user and classed as Spam would return to the sender an SMTP error message " 550 <vkmhyyr@nortel.com>... no such user (reported by Mail Server)"

So email would report back to the servers as 505. If sent by a zombie or open relay this could potentially take the zombie site down due to volume (like a DOS attack).

The basic strategy of the method is multifold:

First, it denies the spammer knowledge that his email mailing list contains valid email addresses. The spammer cannot trust the validity of the list and the vendor of the list. Sellers will start to derive lower value for emailing lists that do not appear to be valuable. Lists stolen from companies and sold and even harvested by bots will start to appear to have limited value, reducing the return for harvesting or res...