List poisoning

List poisoning

The term list poisoning as related to electronic mail (e-mail), refers to poisoning a mailing list with invalid e-mail addresses.

Industry uses

Once a mailing list has been poisoned with a number of invalid e-mail addresses, the resources required to send a message to this list has increased, even though the number of valid recipients has not. If one can poison a spammer's mailing list, one can force the spammer to exhaust more resources to send e-mail, in theory costing the spammer money and time.

Poisoning spammer's mailing lists is usually done by posting invalid email addresses in a Usenet forum or on a web page, where spammers are believed to harvest email addresses for their mailing lists. If using a dynamically generated web site for poisoning, the web site could link to itself infinitely, theoretically causing a spammer's mailing list to be substantially poisoned.

Vulnerabilities

* Syntactically invalid email addresses used to poison a mailing list could be easily filtered out by the spammers, while using email addresses that are syntactically correct could cause problems for the mail server responsible for the email address.
* Implementations of spam poisoning systems can be avoided, if spammers learn of their location.
* Spammers often steal resources so that the efficiency of a mailing places little financial burden on the spammer.

Implementations

*List poisoning [http://www.monkeys.com/wpoison/ code written in Perl] .

*List poisoning [http://www.webmasterworld.com/forum88/3104.htm code written in PHP] .

*Simple list poisoning [http://zzzy.freeshell.org/ code written in BASH shell script] and a [http://zzzy.freeshell.org/guestbook working example] .

*An [http://www.spampoison.com/ example of list poisoning] using a shared CGI at a public URL (Implemented on 1,470,000 sites).

ee also

*Address munging
*Botnet
*E-mail address harvesting
*Spamtrap
*Stopping e-mail abuse


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