About DKIM

The DomainKeys Identified Mail (DKIM) Internet standard enables email senders to digitally sign their messages so that receivers can verify that those messages have not been forged. The DKIM sender authentication scheme allows the recipient of a message to confirm a message originated with the sender's domain and that the message content has not been altered. A cryptography-based solution, DKIM provides businesses an industry-standard method for mitigating email fraud and protecting an organization's brand and reputation at a relatively low implementation cost. Learn more about DKIM.

The DKIM base specification is being spearheaded by Sendmail, Inc. in conjunction with Cisco and Yahoo!.

DKIM-MILTER

Sendmail, Inc. has released a free, Open Source implementation of the DKIM signing and verifying software. A portable API is available to allow DKIM to be embedded into any application. Also provided is a "milter" (mail filter) plugin for Open Source sendmail, the world's leading Mail Transfer Agent (MTA). The milter plugin allows system administrators to easily sign and verify messages using DKIM signatures. The DKIM-milter is supported by:

• Open Source: sendmail 8.12 or later
• Open Source: Postfix 2.3 or later
• Commercial: Sendmail Switch™ MTA 3.0 or later
• Commercial: Sentrion™ Email Security Appliances

For more technical details, to download the DKIM API and milter, or to contribute to the DKIM project, go to the Sourceforge project page. More information is also available at dkim.org.

Sendmail Company Overview

With 25 years leadership delivering innovative messaging technology, Sendmail ensures the protection and trust of Internet communications. Driven by the industry's most powerful policy engine, Sendmail technology provides protection where 80% of security and compliance violations occur - inbound and outbound messaging. Sendmail provides commercial products and is the primary contributor to Sendmail Open Source Project.

Sendmail DKIM Quickstart Service

The Sendmail DKIM QuickStart enables large enterprises with complex messaging environments to expedite the implementation of DKIM to successfully defend against messaging forgery and fraud. To find out more about why businesses are turning to Sendmail to be their trusted DKIM advisor and implementation support partner, call +1-87-SENDMAIL (877-363-6245) or +1-510-594-5400 or email us at: dkim-qs@sendmail.com For more information about DKIM and Sendmail's support of the DKIM specification, please download the DKIM FAQ.