Archive for the ‘DKIM’ Category

Stopping Email Abuse in IPv6 Networks

Tuesday, June 05, 2012 by Kevin San Diego

Many service providers, network providers, and corporations plan to launch additional IPv6 networks and on-line services during this year’s World IPv6 Day, which falls on June 6th, 2012. IPv6 promises to enable deployment of a seemingly endless number of networks and devices.  IPv6 provides 128-bits of addressable space, while IPv4 only provides 32-bits.  This means […]

DKIM Helps and Hurts Google, YouTube and SalesForce

Thursday, January 26, 2012 by Murray Kucherawy

Google has been using DKIM to improve trust in mail it sends from several of its properties for some time now. Mail from Google staffers ( and, from YouTube (, from Google Groups ( and from Gmail users ( is always signed by DKIM using those respective domains as the signer. This means we […]

Highlights from IETF 82 in Taipei

Tuesday, November 29, 2011 by Murray Kucherawy

The Internet Engineering Task Force met in Taipei in mid-November. Cloudmark was in attendance, working to advance several things through the IETF processes, including a new working group that will produce protocols and advice documents relevant to reputation services (see my previous posts about DKIM and domain reputation); creation of a working group seeking advancement […]

The Federal Government and Email Security

Sunday, October 09, 2011 by Murray Kucherawy

This week, at the Federal Cybersecurity Conference & Workshop in Baltimore hosted by the Department of Homeland Security, there was a panel on Email Authentication that explained why authenticated email is vital to their interests. Being able to trust email from federal agencies is highly important to them, not merely for communication among agencies but […]

DKIM, New and Improved

Thursday, September 22, 2011 by Murray Kucherawy

After numerous discussions and spirited debate, the IETF has finally published a couple of important new RFCs related to DKIM. RFC6376 is the update to DKIM itself that does a thorough job cleaning up the original version, and RFC6377 provides recommended practices for using DKIM with respect to mailing lists. With this, DKIM has advanced […]

Exciting Times

Tuesday, July 19, 2011 by Murray Kucherawy

The Internet Engineering Task Force (IETF) will be meeting next week in Quebec City. The IETF, which produces the RFC document series that defines Internet standards, hosts a lot of activity that is of current interest to the messaging security community. Cloudmark is a very active participant in these processes, as a means of staying […]

The value of domain names and email

Tuesday, April 19, 2011 by Murray Kucherawy

The Internet Engineering Task Force (IETF) met last month in Prague.  Among the dozens of working groups striving to produce standards and guidelines to make the Internet work better, there is one called DKIM, or DomainKeys Identified Mail.  They’ve been working for several years to produce new email standards that can be added invisibly to […]

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