Habeas Inc. announced the creation of SenderIndex, an email reputation database of over 60 million IP addresses and domains, designed to help authenticate email senders. And it’s free, too.
Sender ID: The Next Wave in Email Protection
So what’s all this talk about “Sender ID” and what exactly does it mean to you as an email user? Sender ID is the convergence of Microsoft’s “Caller ID” and Meng Wong’s “Sender Policy Framework” (SPF).