Yahoo Mail Used for Spam
According to an article on CNET, email spammers are using Yahoo’s email authentication servers to help fool spam filters and increase the delivery rates of spam campaigns.

So, how exactly are spammers using Yahoo’s mail to achieve this?
What this does is strip out the usual Yahoo advertising banners and help validate the mail as legitimate to escape most spam filters. MessageLabs found that anyone with a standard Yahoo account can also authenticate to the Yahoo Plus servers and send mail, without necessarily paying for the premium service. Sunner said in a interview with CNET News.com that this isn’t a flaw; it appears that’s just how the Yahoo service was designed.
The part of this story that I found the most interesting was that approximately forty new Yahoo mail IDs are being generated everyday. While that in itself isn’t particularly exciting, the fact that they are being automatically generated is. Since the accounts are being generated automatically, the spammers have found a way to defeat Yahoo’s current CAPTCHA system.
Of all the web’s technologies, CAPTCHA seems to be one of a select few that are lagging far behind. However, there are some innovative ideas, they just haven’t been implemented. If you want to try out an innovative system, I recommend Microsoft’s Asirra:
Asirra is a human interactive proof that asks users to identify photos of cats and dogs. It’s powered by over three million photos from our unique partnership with Petfinder.com. Protect your web site with Asirra — free!









