New ARC Implementations at IETF 99 Hackathon

An ARC table was organized at the weekend hackathon held before the IETF 99 meeting in Prague this week. ARC is an official work item of the IETF DMARC Working Group, and will be discussed during the working group meeting Thursday morning.

Participants from two different vendors worked on new implementations of ARC, compatible with their software stacks. By the end of the weekend, one of these implementations was able to validated multiple-hop ARC chains, which is perhaps the hardest part of any implementation. And a participant from a third vendor indicated they have made significant progress in developing their own ARC implementation prior to the weekend.

If you compare this to all proprietary and open source implementations known before the hackathon, it will represent a 60% increase in the number of ARC implementations when they are completed. In addition to the implementations mentioned, the weekend included more interoperability testing, bug hunting, patch generation, and pull requests.

Many thanks to all the participants at the hackathon, whether they were in the room or working remotely!

ARC Packages And Modules Available

Several packages and libraries implementing ARC are now available, and are linked from our new Resources page. Mailbox providers and maintainers of mailing list manager (MLM) software can use these components to start adding ARC functionality to their products and services today.

For those creating their own ARC modules and products, the new ARC test suite from ValiMail is an ideal validation tool – and completely free to use. The test suite has been used to validate the dkimpy package with an Python library and command line tools, and the OpenARC milter is currently being validated.

Or if you just want a turnkey solution, add ARC to your platform by using the fully supported MailerQ commercial MTA from Copernica.

Patches to add ARC functions to the Mailman MLM should be available soon, and ARC should be integrated into the Sympa MLM by mid-year.

 

Two ARC Implementations Tested At Interoperability Event

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), DMARC.org, 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 DMARC.org. 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 http://arc-spec.org.