1. Mail-Filters Technical Presentation How it works, Why it’s Better

2. Mail-Filter Technology Overview Why Mail-Filters Bullet Signature Creation Star Engine Process Overview Implementation Options SDK Contents Getting Started The API Commands Testing Options OEM Implementation Examples FAQs

3. Why Mail-Filters It’s Fast – 100s of messages per second (or higher) It’s Accurate – over 95% of spam caught, less than 1 in 1,000,000 false positive rate Many implementation options – the right solution for any environment It’s Proprietary – it’s not fooled by spammer tricks - gives time to market and competitive differentiation It catches Foreign Language Spam – in over 30 languages – a worldwide solution Easy Implementation – usually less than a day Full Support – Integration, technical support and training, marketing materials, sales training and lead generation

4. How Mail-Filters Works 2. Human Editors Craft Bullet Signatures 1. Spam Collection occurs from many sources 3. Bullet Signatures Are Updated Every 1-15 Minutes 4. Mail-Filters Technology Integrated into OEM Solutions - Catches Spam, without False Positives 5. Tuning Users and Administrators provide feedback to help identify spam and those that send them.

5. Bullet Signature Creation Mail-Filters’ Process Overview To Capture Spam & Create Bullet Signatures www Phish Trolling Quality Check Translation Tools Customer submissions Bullet Signatures Aristotle (Signature Auto-Suggest) Customer Mail-Filters Technology on Customer Device Spam DB Prioritization Process International Spam Harvester Partner Collections Phish Traps www Traffic and Connection Heuristics Spam Pre-Qualification Partner Pre-Qualification Expert Auto-Nominate Process Bullet Signature Updater Scam Sensors Traffic Analysis Pre-Qualified & Auto-Nominated Reputation Analysis Human Editors Language Assignment Spammer Profile Creation Data Quality Manager Culling Engine Mail-Filters Data Centers Message Profile Creation Traffic Profiles Bullet Signature Updates

6. STAR Engine Server STAR Engine Management Module Message Normalizer SnowFlake Buster Language Analyzer Malformed Message Processor Message Analysis Traffic Analysis Reputation Analysis Spammer Profile Check False Positive Rationalizer Bullet Signatures Bullet Signature Updater Mail-Filters Data Centers Known Good Mail Star Engine Process Overview Star Engine Interface OEM Software Is Message Spam? Yes / No

7. Implementation Options Enterprise –Most typical implementation – highest performance – uses more resources Desktop –Small footprint – message is local – scan and database is remote Embedded –Tiny amount of resources required – scanning is done remotely

8. Star Engine – Enterprise (Very High Performance) Can process 100s or even over 1000 messages per second Requests Bullet Signature updates every 1-10 minutes ( only changes are downloaded) The SEI and SES are typically deployed on the same hardware The SEI is linked into the OEM application using C or C++ The SES runs as a Service or Daemon and it manages it’s own Database Updates The Database is usually between 3-10MB – will download a fresh DB upon startup if none present OEM Application Server or Appliance Hardware Star Engine Interface (SEI) Star Engine Server (SES) (Service or Daemon) Linked Together by OEM at compile C or C++ API TCP / IP Mail-Filters Data Centers TCP / IP

9. Star Engine - Enterprise The Star Engine Server is fully multi-threaded The Star Engine Server will run as a Service under Windows or as a Daemon under Linux, FreeBSD, or Solaris TCP/IP outbound on Port 80 is required – IP proxies are supported Typical requirements are P4, 100MB RAM, Hard Disk optional A unique Mail-Filters Customer ID is required to download the Bullet Signature Database

10. Star Engine – Desktop (Small Footprint) Only requires 128kb of RAM Can process 10s of messages per second Secondary server can be anywhere, including and typically Mail-Filters’ Data Centers Database updates are not required on the SEI (just the SES) Same exact API as the Enterprise implementation Can also be used in a server cluster environment – many SEI’s feeding one SES OEM Application PC or Other Device (with limited resources ) Star Engine Interface Linked Together by OEM at compile C or C++ API TCP / IP Mail-Filters Data Centers TCP / IP Star Engine Server Separate Server

11. Star Engine – Embedded A Completely New Approach Anti-Spam detection for edge devices with almost no resource requirements OEM code requires less than 10kb of RAM No software need be installed on any user PC – the service is turned on or off at the OEM device Works with POP3 & IMAP OEM device intercepts the message delivery request and sends it to Mail- Filters Mail-Filters receives the messages on behalf of the end user, filters for viruses and spam, then sends the clean messages to the end user OEM or customer determines what happens to spam (delete, mark with an X- header, decorate the subject line) Since spam can be deleted and the downlink speed is probably slower than the link from Mail-Filters’ data centers to the email servers – good mail will get to the end user faster. WWW PC Mail-Filters Data Centers Email Server 1. Email Client requests mail 2. OEM device intercepts the request based on port the request is made on (Ex. 110 = POP3) – and redirects the request to Mail-Filters’ data centers. 3, Mail-Filters makes the request on behalf of the user, filters the messages, then sends the good mail to the user. No mail is kept at Mail- Filters – it just passes through. 4. Mail-Filters’ authenticates as the user to the ISP or Corporate email servers - the mail is delivered

12. Embedded Architecture OEM Application OEM Device Redirect Code Outbound Listening Code (Port 110 for POP3 or Port 147 for IMAP Requests) Customer Premise The Internet The Email Client requests email from an email server – it makes the request on port 110 or 147 – the OEM device redirects the request to Mail-Filters. A port is opened by the email server via Mail-Filters to the PC. The email is filtered, a policy is applied, then delivered to the Email Client. Mail-Filters Data Centers Email Server PCs

13. SDK Contents Star Engine Server software executables Star Engine Interface libraries in C and C++ Simple Single-Threaded implementation example application Documentation Typical integration time is less than a day

14. Getting Started with the SDK Install the Star Engine Server Run the Star Engine Server Run the Example Application –This application will scan the files in the directory of choice and all sub-directories to see if they are spam. The results will display on the screen. Begin the Integration to the OEM application

15. The Star Engine API (The Star Engine Interface) The Commands are Straight-Forward –Initialize – This command establishes a connection to the Star Engine Server –Shutdown – Used to tear down the thread after a successful Initialize command –Scan SMTP Buffer – Passes the SES the data to be scanned – will return TRUE if Spam –SCAN Buffer – Passes the SES data to be scanned – best used for non-SMTP types of content such as IM, SMS, web pages, etc. –Version – Returns the versions of all the components currently being used, including the database version date.

16. Testing Options The Mail-Filters database is culled to eliminate old/unused signatures. –As a result, the catch rate will suffer on old corpuses of email –Best results are obtained with live (or very close to it) email. There are several options to test the Mail-Filters technology –To test for catch rate or false positive rate Use the Example scan utility to check individual messages in a directory Send mail to an account Mail-Filters can set up for you at Cleantree.com. Good mail will go to the Inbox, spam to the Spam folder. Check results using your browser. Integrate into the OEM application and run it to check catch rate. –To test throughput: Unfortunately, the Example application is only a single-threaded application and will not show what the SES can achieve throughput-wise (it does fine on catch rate) The only fair test is to do an integration and run email through it. Most OEMs fine the solution throughput is the same whether Mail-Filters technology is running or not. –To test Foreign Language: Do a beta test with a customer or partner in the region of interest Mail-Filters have several partners in various regions that may assist in a beta test, if desired.

17. Implementation Examples Enterprise –Most OEMs have implemented the Mail-Filters technology as the primary anti-spam solution AV solutions company scans for spam while it has the message in memory to scan for viruses. Because spam is more prevalent and is a much faster scan, spam is typically scanned for first. –Some have augmented their own anti-spam technology Because Mail-Filters technology is both fast and accurate, some have used it as a pre-processor to their own, more computationally expensive technology, to increase the throughput of the overall solution, and to increase spam catch rates.

18. Implementation Examples Desktop –Some devices don’t have the processing power or resources available for spam detection. For these, the Mail-Filters technology can provide a smaller footprint Firewalls, security gateways, messaging gateways, enterprise PCs may prefer a secondary server to handle the scanning to free up resources on their own hardware. –An MSP has a cluster environment where there are many SEIs feeding one SES per tower. This is very efficient and allows their overall throughput to increase dramatically.

19. Implementation Examples Embedded –Ideal for DSL routers, Cable Modems, Wireless gateways, SMB security gateways etc. –Because it requires no end user software installation or configuration, it is simple to sign- up and have spam and viruses eliminated.

20. Frequently Asked Questions How do I get the SDK? –Sign the Mail-Filters MNDA and we’ll send it to you via email. Is the Star Engine Server multi-threaded? –Yes. Does it handle messages in double-byte character sets? –Yes, our technology catches spam in over 30 languages, including multi-byte character sets such as Japanese, Korean, Chinese, Arabic, and Hebrew. How is the update interval set – can it be changed? –The update interval is set by the OEM, but can be changed on a customer by customer basis. The default is an incremental every 10 minutes and a full update written to disk once a week. Will this solution work on less than a Pentium IV PC? –Yes, but it works more efficiently on a PIV.

21. Frequently Asked Questions What happens if the SES can’t get a database, or quits running, or some other catastrophe? –The SES or SEI will fail safe. It will return a FALSE ( the message isn’t spam) and continue to process messages while trying to reconnect. The customer will see more missed spam, but won’t miss any messages. What if the SES doesn’t have the rights to write the database to disk, or the disk is full? – The SES will continue to function properly and will acquire updates to the database in memory. The version command will return the database currently being used in RAM. Is the API really just 5 functions? –Yes – it doesn’t get much simpler than that. Can the SES return a probability of a message being spam? –No - Because the technology uses human editors to craft profiles and message signatures, we’re very very confident the message is spam if we identify it. Because our false positive rate is so low, our methodology is proven to be correct. A probability is required by technologies that guess or compute whether a message is spam – we know it, so we tell you. For those solutions that require a probability, they set our TRUE response to the highest probability – 10 or 1 or 100.

22. Conclusions The Mail-Filters technology is easy to implement and provides options for any situation. The underlying technology far surpasses what others are doing, giving the Mail-Filters OEM a significant advantage over competitors in catch rate and accuracy, language coverage, and throughput. Human review provides the difference -the technology delivers it.