DomainKeys – spammer’s new BFF?

My pet peeve is Yahoo!’s ability (or lack thereof) to filter spam effectively because even legitimate emails using DomainKeys Identified Mail (DKIM) are being routed to the spam folder while spam’s going to my Inbox. As if this wasn’t bad enough, even spammers have started using DKIM, thereby rendering this authentication method useless.

The way DKIM works is that it allows verification of the domain that an email originated from, so a spammer can’t use a fake email address. However, this system is seriously flawed as I realized recently because now even spammers use it. Here’s an example:

Both Yahoo and Google use DKIM email authentication protocol to ensure legitimate emails are delivered but spam is blocked. But if this protocol is so easy to manipulate that even spammers have started using it,  then what’s the point of authentication?