"Caller ID for E-Mail: The Next Step to Deterring Spam" is the Microsoft draft specification to address the widespread problem of domain spoofing. Domain spoofing refers specifically to the use of someone else's domain name when sending a message.

Caller ID for e-mail would verify that each e-mail message originates from the Internet domain it claims to come from. Eliminating domain spoofing will help legitimate senders protect their domain names and reputations, and help recipients more effectively identify and filter junk e-mail.

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Kerio Connect is the first commercial mailserver with CallerID technology on the market.