PRESS RELEASE

Sunnyvale, CA May 24, 2011 Commtouch' (Nasdaq: CTCH), a leading Internet security provider, announced today that it is rolling out solutions to protect against the significantly higher threat potential created by the technological flexibility of IPv6.

With World IPv6 day planned for June 8th, Commtouch is sponsoring a series of on-demand webcasts to educate about IPv6 and what it means for businesses networks. In the first webcast An introduction to IPv6, Limor Schafman, president of KeystoneTech Group, and Dale Geesey, COO of Auspex Technologies, cover what IPv6 is, why its different, the advantages, the transition period from IPv4 and how organizations should start preparing.

IPv6 brings significant opportunities both business and technical and will require well-planned deployment and management, said Mr. Geesey. We plan to provide organizations with the baseline they need to begin to leverage the benefits and overcome the implementation hurdles.

The vastly increased address space available in IPv6 significantly reduces the effectiveness of traditional blacklisting methods, making it harder to associate a rogue computer with its source address. In addition, network infrastructure requires upgrading in order to parse, route and store addresses in the new format.

Commtouchs cloud-based GlobalView Network and engine technology will soon include new functionality to protect against the threats posed by IPv6. The Commtouch services expected to be enhanced by the end of Q3 2011 include: GlobalView Mail Reputation, Anti-Spam, Zero-Hour Virus Outbreak Protection, and GlobalView URL Filtering.

IPv6 is expected to create many challenges on the security front, said Amir Lev, Commtouchs chief technology officer. Readying our network and products, as companies start IPv6 deployment, illustrates our commitment to proactively dealing with new threats.

Commtouch will be providing descriptions of the new types of threats to be expected on its IPv6 website (only IPv6 enabled users may access this Commtouch site).

The full link for the Webcast is: http://www.commtouch.com/introduction-ipv6.

About Limor Schafman

Limor is President of the KeystoneTech Group. She is an expert on the practical use of technology and its possibilities in the areas of mobile & wireless, video games, digital media, advertising, hardware development and software systems. She is a frequent speaker & moderator at conferences such as CES. Limor is the co-founder and Chair Emeritus of the IPv6 Forum Israel Chapter and former host of thought leadership web shows including DigIn! Radio and Crash Course. Limors blog is: www.diginblog.com

About Dale Geesey

Dale is the COO of Auspex Technologies. He is a Security, networking and IT professional focused on IPv6 and Cyber Security. He specializes in the introduction of advanced and next generation technologies. For the past 20 years Dale has been working with the US federal government, department of defense and telecom carriers. Hes been involved in supporting the US governments IPv6 Transition activities since 2004 and is a frequent speaker at Internet and technology events. Dales website is: www.auspextech.com

About Commtouch Commtouch' (NASDAQ: CTCH) provides proven Internet security technology to more than 150 security companies and service providers for integration into their solutions. Commtouchs GlobalView and patented Recurrent Pattern Detection (RPD) technologies are founded on a unique cloud-based approach, and work together in a comprehensive feedback loop to protect effectively in all languages and formats. Commtouchs Command Antivirus' utilizes a multi-layered approach to provide award winning malware detection and industry-leading performance. Commtouch technology automatically analyzes billions of Internet transactions in real-time in its global data centers to identify new threats as they are initiated, enabling our partners and customers to protect end-users from spam and malware, and enabling safe, compliant browsing. The companys expertise in building efficient, massive-scale security services has resulted in mitigating Internet threats for thousands of organizations and hundreds of millions of users in 190 countries. Commtouch was founded in 1991, is headquartered in Netanya, Israel, and has a subsidiary with offices in Sunnyvale, California and Palm Beach Gardens, Florida.

Stay abreast of the latest news at the Commtouch Caf: http://blog.commtouch.com. For more information about enhancing security offerings with Commtouch technology, see http://www.commtouch.com or write to [email protected].

Recurrent Pattern Detection, RPD, Zero-Hour and GlobalView are trademarks, and Commtouch, Authentium, Command Antivirus and Command Anti-malware are registered trademarks, of Commtouch. U.S. Patent No. 6,330,590 is owned by Commtouch. All other trademarks are the property of their respective owners.