Emeryville, Calif. — May 23, 2007 — Sendmail, the leading provider of policy-centric solutions for securing and authenticating business communications, today announced the availability of Domain Keys Identified Mail (DKIM) authentication technology in the company's Sentrion security appliances, as well as commercial Sendmail Switch and Open Source mail servers. This announcement coincides with the Internet Engineering Task Force (IETF) approval of DKIM as an Internet Standard (see related release: "IETF Approves DomainKeys Identified Mail as Proposed Internet Standard; Authenticating Technology Addresses Fraudulent Email and Phishing Scams" dated today). By verifying incoming messages organizations can weed out targeted spoofing and phishing threats, reduce false positives and eliminate identifiable spam.

"As a principle author of the specification, Sendmail takes great pride in our leadership role in moving DKIM through standardization. DKIM has the potential to restore trust in Internet communications by significantly reducing the impact of email fraud on organizations and end-users. This speaks to the very core of Sendmail's mission," said Donald J. Massaro, president and CEO, Sendmail, Inc.

DKIM enables email senders to digitally sign their messages so that receivers can verify 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 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. To speed enterprise adoption, Sendmail has created a DKIM Packaged Service, this offering allows organizations to quickly implement DKIM without having to redeploy staff or disrupt messaging operations.

DKIM has unprecedented support from a long list of Fortune 1000 enterprises, leading technology companies and service providers. For a complete list of supporters please visit: http://www.dkim.org/deploy/supporters.html.

"After a three year effort spearheading and co-authoring this significant email security standard, we are thrilled to offer DKIM, now a standard, to our customers" said Eric Allman, co-founder and chief science officer, Sendmail. "The incorporation of DKIM in our Sentrion appliance, commercial Sendmail Switch and Open Source mail server extends our goal of providing our commercial and Open Source communities with the most technologically advanced, standards-based messaging solutions available. The value of this technology is tremendous relative to its cost, and we expect to see rapid industry-wide adoption."

Using the Sentrion email gateway security appliance, the commercial Sendmail Switch mail server or Sendmail's Open Source mail server, organizations can now sign outbound and validate inbound email, similar to using a passport at the airport. By leveraging DKIM, the Sendmail policy engine can apply intelligent policies to determine how a message should be processed based on verified and unverified signatures and senders' published signing rules. Sendmail can effectively grade email into verified, suspect or forged categories, significantly improving a company's defense against spoofing, phishing, spam and false positives.

To provide an additional layer of defense against unwanted messaging and fraud Sendmail provides an IP Reputation service. Commercially available, Sendmail IP Reputation dynamically collects and classifies hundreds of millions of messages per day.