SOURCE: Proofpoint


August 16, 2011 09:00 ET

Proofpoint Purchases SORBS Anti-Spam Service Assets

Company Leveraging SORBS Operational Data to Enhance Enterprise Email Security, Providing Resources to Improve Accuracy and Responsiveness of Free SORBS Service

SUNNYVALE, CA--(Marketwire - Aug 16, 2011) - Proofpoint, Inc., the leading provider of cloud-based security and compliance solutions for enterprise messaging and collaboration, today announced it has acquired the assets of the SORBS (Spam and Open Relay Blocking System) service ( Approximately 200,000 organizations worldwide leverage the SORBS DNS-based Block List (DNSBL) to effectively block email from more than 12 million host servers known to disseminate spam, phishing attacks and other forms of malicious email. The purchase enables Proofpoint to develop enhanced real-time detection capabilities and intelligence about email-borne threats for its enterprise customers, based on the service's extensive visibility into email traffic patterns and trends. Proofpoint is devoting additional development and support resources to SORBS to improve both the accuracy of the service and the timeliness of response to support and dispute inquiries.

"By processing billions of requests for hundreds of thousands of organizations worldwide, SORBS offers the internet community a much-needed service and provides Proofpoint with unique visibility into global traffic trends," said Gary Steele, CEO of Proofpoint. "This acquisition will help us continue to deliver the industry's most innovative and effective anti-spam solutions while giving SORBS the resources it needs to be more responsive to its extensive user base and to the online community at large."

The acquisition was completed in July 2011 for an undisclosed amount. SORBS is owned and operated by a Maltese subsidiary of Proofpoint, Inc., and continues to be available as a free, standalone service. Support and service inquiries related to SORBS continue to be handled through the SORBS website at

Since its launch in 2003, the SORBS DNSBL has grown from a list of 78,000 to more than 12 million host servers known to disseminate spam and now processes tens of billions of requests per day. The list typically includes hosts designed specifically for spreading spam, hacked and hijacked servers, and those with Trojan infestations. In an attempt to provide preemptive protection, SORBS also lists servers with dynamically allocated IP addresses.

Proofpoint is known for developing innovative and highly-effective approaches to spam detection, leveraging machine-learning techniques to accurately identify spam based on a variety of factors including message content, structure and sender reputation. Proofpoint's commercial email security and compliance solutions are used by thousands of organizations worldwide to block spam and viruses, safeguard privacy, encrypt sensitive information, and archive messages for easier management and discovery.

About Proofpoint, Inc.
Proofpoint focuses exclusively on the art and science of cloud-based email security, eDiscovery and compliance solutions. Organizations around the world depend on Proofpoint's expertise, patented technologies and on-demand delivery system to protect against spam and viruses, safeguard privacy, encrypt sensitive information, and archive messages for easier management and discovery. Proofpoint's enterprise email solutions mitigate the challenges and amplify the benefits of enterprise messaging. Learn more at

Proofpoint and SORBS are trademarks and/or registered trademarks of Proofpoint, Inc. or its subsidiaries in the US and/or other countries. All other trademarks contained herein are the property of their respective owners.

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