Firms using Agari for their outgoing mail pay a fee for its trusted stamp.

FORBES: Cisco-Spawned Startup Agari Aims To Finally Kill Phishing

Agari, in other words, is pitching itself not as a spam-filtering company so much as a brand-protection firm.

FORBES: Cisco-Spawned Startup Agari Aims To Finally Kill Phishing

Peterson says that Agari hopes to offers its authentication data to other spam filtering services run by McAfee and Symantec.

FORBES: Cisco-Spawned Startup Agari Aims To Finally Kill Phishing

And a few interesting companies like Agari, formerly Authentication Metrics Inc, (AMI) have built a service around this technology that lets senders fraud-proof their mail.

FORBES: Authenticate This!

On the sending side, Agari already has at least one major customer win: Facebook, which according to Peterson sends more email than any other online service.

FORBES: Cisco-Spawned Startup Agari Aims To Finally Kill Phishing

Agari has already signed up Google, Yahoo!

FORBES: Cisco-Spawned Startup Agari Aims To Finally Kill Phishing