On the downside, it does have a noticeable false positive rate. One of my customers' emails are all tagged (fortunately, not causing any damage), and I noticed that another customer is getting a good amount of email from many different manufacturing outfits - and three different sending domains (valid ones) were being tagged.
FWIW, this test may hit hard and fast, similar to the "no vanity reverse DNS" (which has been highly debated, but many people still do it -- yet there is no evidence that any used such a test before May, 2003) and "no reverse DNS" (which has been used for years, but over the past few months, the FP ratio has gone down significantly).
Until a few days ago, I had never heard of doing this. However, there is already one mailserver that is outright rejecting such E-mail, and it appears that several anti-spam packages are starting to do this.
As with any test, it does have some false positives. But it appears that they are very low.
-Scott
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