Sites selling spam goods and services are being targeted
Internet portal Lycos has made a screensaver that endlessly requests data from sites that sell the goods and services mentioned in spam e-mail.
Lycos hopes it will make the monthly bandwidth bills of spammers soar by keeping their servers running flat out.
The net firm estimates that if enough people sign up and download the tool, spammers could end up paying to send out terabytes of data.
Cost curve
"We've never really solved the big problem of spam which is that its so damn cheap and easy to do," said Malte Pollmann, spokesman for Lycos Europe.
"In the past we have built up the spam filtering systems for our users," he said, "but now we are going to go one step further."
Before now users have never had the chance to be a bit more offensive
Malte Pollmann, Lycos
By getting thousands of people to download and use the screensaver, Lycos hopes to get spamming websites constantly running at almost full capacity.
Mr Pollmann said there was no intention to stop the spam websites working by subjecting them with too much data to cope with.
He said the screensaver had been carefully written to ensure that the amount of traffic it generated from each user did not overload the web.
"Every single user will contribute three to four megabytes per day," he said, "about one MP3 file."
But, he said, if enough people sign up spamming websites could be force to pay for gigabytes of traffic every single day.
Lycos did not want to use e-mail to fight back, said Mr Pollmann.
"That would be fighting one bad thing with another bad thing," he said.
Slow down
The sites being targeted are those mentioned in spam e-mail messages and which sell the goods and services on offer.
Bill Gates is reportedly the world's most spammed person
The list of sites that the screensaver will target is taken from real-time blacklists generated by organisations such as Spamcop. To limit the chance of mistakes being made, Lycos is using people to ensure that the sites are selling spam goods.
As these sites rarely use advertising to offset hosting costs, the burden of high-bandwidth bills could make spam too expensive, said Mr Pollmann.
Sites will also slow down under the weight of data requests. Early results show that response times of some sites have deteriorated by up to 85%.
Users do not have to be registered users of Lycos to download and use the screensaver.
While working, the screensaver shows the websites that are being bothered with requests for data.
The screensaver is due to be launched across Europe on 1 December and before now has only been trialled in Sweden.
Despite the soft launch, Mr Pollmann said that the screensaver had been downloaded more than 20,000 times in the last four days.
"There's a huge user demand to not only filter spam day-by-day but to do something more," he said "Before now users have never had the chance to be a bit more offensive."
Internet portal and mail-provider Lycos Europe has launched a program to increase spammers' bills by having thousands of voluntary users' computers repeatedly query websites from which spam originates. Such a tactic would increase the bandwidth costs for these websites. However, it also faces legal questions.

Spamming, the mass sending of unsolicited emails, is lucrative in part because each email can be sent for nearly insignificant costs. With such low costs, a commercial spammer needs only to have a very small number of recipients buy their product to make a profit. The goal of many anti-spam proposals has been to increase the cost of spammers sending messages. Lycos' approach is to make it more expensive to maintain servers that send spam.

Volunteers may download the screensaver from the  Lycos website for it. The program would run on a user's computer in the background and request about three megabytes (3MBs) of data every day. The screensaver shows which spam server is being targeted by the user, where the server is located, and how many others are attacking it at that moment. Target email servers are selected from blacklists from anti-spam organizations, with Lycos' own verification.

Legal issues arise over whether this can be interpreted as a denial of service attack. In such an attack, computers overwhelm a webserver with requests for data to the point where it does not have the resources to fulfill its normal function. Lycos, in explanatory material on the screensaver's dedicated website ( http://makelovenotspam.com ), claims that its technology closely monitors the screensavers' effects on targeted websites and prevents any of them from being completely shut down by information requests. 

Lycos Europe operates in Germany where, according to Joerg Heidrich of Heise Zeitschriften Verlag, less than completely shutting down a server is not clearly illegal under the penal code. It may, however, be actionable under the civil code. But Lycos may be betting that no one will file a suit, as that would require those participating in illegal spamming to reveal their identity.

The website no longer allows downloads of the screensaver, and users of the screensaver cannot connect to spam sites, but are instead given the message 'Stay Tuned'