From On February 19th representatives from AOL (NYSE:VZ) and Google (NASDAQ:GOOG) successfully tested the first two implementations of the ARC protocol at an interoperability event. LinkedIn (NYSE:LNKD) hosted the in-person, all-day event at their San Francisco offices and facilitated the testing. Also participating were representatives from Cloudmark, Comcast (NASDAQ:CMCSA),, the Trusted Domain Project, and Message Systems/SparkPost.

“We set an aggressive target for testing when we announced the ARC protocol in October. AOL and Google did an outstanding job developing implementations and preparing test systems in time for this event,” said Steven M. Jones, executive director of ARC addresses a small but important class of messages, like mailing lists and forwarding services, that are impacted when a sending domain has a strong DMARC policy. Jones added, “I think ARC will allow more consumer mailbox providers and other domain operators to join AOL and Yahoo (NASDAQ:YHOO) in adopting such policies in order to better protect their users and their users’ correspondents from fraudulent messages.”

More implementations of ARC are under development, including an open source package that could be used to add ARC capabilities to existing email services. Additional interoperability testing events will be held between now and mid-year. For more information please visit the ARC protocol website at

About is an initiative of the Trusted Domain Project (TDP), a non-profit and tax-exempt public benefit corporation, and is supported by the following sponsors: Agari, Comcast (NASDAQ: CMCSA), Farsight Security, Google (NASDAQ: GOOG), and ReturnPath. Additional support is provided by: Message Systems, PayPal (NASDAQ: PYPL), and ValiMail. is dedicated to promoting the use of DMARC and related email authentication technologies to reduce fraudulent email, in a way that can be sustained at Internet scale. More information about is available at the website