Simple were the days when one could just send an email without worrying about whether that mail is ending up in the recipient's mail box or somewhere else. But with the explosion of the use of electronic mail came myriad problems: spams, malicious software, botnets, rampant cybercrime and loads of technologies to check spams most of which not only fail to cut spams but also end up sending genuine emails to spam bins.
In yet another ambitious effort to cut spam -- which at the end of the day may end up being as ineffective as all others -- researchers at Yahoo are trying to resurrect the idea of email "postage stamps" which could put a stamp of authenticity to the senders of genuine emails.
Called Centmail, the modus operandi of this pay-per-email plan is simple: senders attach a cent worth of stamp on each email they send so that the receiver (or the receiving server) knows that the email comes from a genuine sender when it sees the stamp. And why would pasting a stamp on the email make it genuine? Because even a cent makes spamming too expensive a proposition for spammers who need to send millions of emails to achieve their objectives.
"The fairly immediate benefit of Centmail will come from getting your message through other spam filter. The first time you sent somebody a message, it often that ends up in the spam filter's bin and trashed," say the researchers of Yahoo, who are working hard to tout this concept.
In other words, Centmail aims to work like an anti spam filter where, unless the spam filter is instructed to trash Centmails too, it will assure delivery of emails to recipients' mail boxes.
The other long term goal of this plan would be, say the researchers, to reduce the amount of spam in the whole electronic mail world.
Centmail is not a new idea though. There have been a few similar efforts in the past like Goodmail, Microsoft's Penny Black project, and an IBM project called Charity Seals to name the most prominent ones.
But all wilted because most users couldn't accept the idea of paying for emails while many thought paying for emails is similar to putting a barrier in the way of sending emails.
Centmail is different, say the Yahoo researchers, because the plan has the concept of charity attached to it. "CentMail, begins as a charity fund-raising tool: Users donate $0.01 to a charity of their choice for each email they send. The user benefits by helping a cause, promoting it to friends, and potentially attracting matching donations, often at no additional cost beyond what they planned to donate anyway. Charitable organizations benefit and so may appeal to their members to join," says its white paper.
The researchers also add that economic approach-based filtering -- that Centmail is -- would be more effective than the others like domain and content based filtering because those do not put the burden of high costs on spammers and cyber criminals.
However, some disagree. According to a security expert, to stop any type of denial of service (DoS) attacks, spams, malware, etc. at or even close to their source of origin requires unforgeable network identity. This means that a filtering system must have the capability to identify a computer from where the spams are originating.
"The simple and the horrific problem of the whole of Internet is that it is largely an anarchic space, and does not know how to identify unforgeable network identity," said the expert.
He added: "The problem we have today is not some mail servers sitting on the Internet firing out lots of mails to everyone. That happens and but we are pretty good at blacklisting 80 percent of such servers."
"But the dangerous problem of spam and malware these days is that they come out of botnets -- computers hacked and taken control of by hackers without the knowledge of the actual owners). And the problem with botnets is that they leave no trace of who is actually controlling them."
He fears that even if Centmail does succeed in cutting spam initially, "it would be only for a few weeks maybe for a few months after which spammers would be able to update their systems to be able to make use Centmail to their advantage as well."
