© Copyright MX Logic, Inc. All rights reserved. 1 Strictly Confidential MX LOGIC CORPORATE OVERVIEW MARCH 2005

© Copyright MX Logic, Inc. All rights reserved. 2 Strictly Confidential Corporate Overview ─ What We Do MX Logic provides advanced defense solutions that safeguard enterprises, service providers, government organizations and resellers worldwide Delivered as a managed service or on-premise software, MX Logic’s technology analyzes over 3 billion messages a month for more than 1.7 million end-users

© Copyright MX Logic, Inc. All rights reserved. 3 Strictly Confidential Corporate Overview SERVICE PROVIDER ENTERPRISE PARTNERS DEFENSE SERVICE 3,900+ enterprise customers 720,000+ end users SOLUTION FEATURES Anti-Spam Anti-Virus DoS Protection Content Filtering Policy Enforcement Abuse Reporting Disaster Recovery DEFENSE SERVICE 3,900+ enterprise customers 720,000+ end users SOLUTION FEATURES Anti-Spam Anti-Virus DoS Protection Content Filtering Policy Enforcement Abuse Reporting Disaster Recovery DEFENSE GATEWAY NTT / Verio Tucows Bellsouth Level 3 Bresnan Communications US Interactive IIJ CyberTrust SOLUTIONS Managed Service Enabling Hosted Mailbox Protection Outbound Filtering DEFENSE GATEWAY NTT / Verio Tucows Bellsouth Level 3 Bresnan Communications US Interactive IIJ CyberTrust SOLUTIONS Managed Service Enabling Hosted Mailbox Protection Outbound Filtering HOSTED STRATEGIC PARTNERS Symantec Surfcontrol DISTRIBUTION PARTNERS 250+ Resellers / VARs Defense Service TECHNOLOGY PARTNERS Symantec / Brightmail Authentium, HP-Compaq NTT/Verio HOSTED STRATEGIC PARTNERS Symantec Surfcontrol DISTRIBUTION PARTNERS 250+ Resellers / VARs Defense Service TECHNOLOGY PARTNERS Symantec / Brightmail Authentium, HP-Compaq NTT/Verio

© Copyright MX Logic, Inc. All rights reserved. 4 Strictly Confidential Corporate Overview – Snapshot of Growth 2003 to % increase in top-line revenue 338% customer growth, currently servicing over 3,900 enterprise accounts and 1.7 million end users 343% increase in seat count Strong growth in VAR channel program with over 250 active channel partners 457% increase in top-line revenue 338% customer growth, currently servicing over 3,900 enterprise accounts and 1.7 million end users 343% increase in seat count Strong growth in VAR channel program with over 250 active channel partners

© Copyright MX Logic, Inc. All rights reserved. 5 Strictly Confidential Strong Customer Growth

© Copyright MX Logic, Inc. All rights reserved. 6 Strictly Confidential Corporate Overview ─ Vision A managed service approach to security will become even more widely adopted –Security software vendors now consider a managed service offering a key component of their marketing strategy –Large enterprise will deploy a layered approach Transport carriers must inoculate their networks threat detection will move from submission technology to sensor networks Software deployment into large service providers creates the best potential for market dominance Bridging the gap between identity management and for outbound message submission will provide new opportunities for service provider penetration A managed service approach to security will become even more widely adopted –Security software vendors now consider a managed service offering a key component of their marketing strategy –Large enterprise will deploy a layered approach Transport carriers must inoculate their networks threat detection will move from submission technology to sensor networks Software deployment into large service providers creates the best potential for market dominance Bridging the gap between identity management and for outbound message submission will provide new opportunities for service provider penetration

SUBSCRIBER REPUTATION FILTERING New Product Initiative from MX Logic

© Copyright MX Logic, Inc. All rights reserved. 8 Strictly Confidential Subscriber Reputation Filtering (SRF) Spam is being distributed through the service provider outbound gateway authentication standards are spawning reputation services (Habeas, Kelkea, Equifax, etc.) Service providers will need to focus on policing their subscriber base to ensure healthy reputation and successful deliverability of subscribe There is little outbound specific anti-spam protection at the sender level ─ majority of focus currently resides with inbound filtering technologies Spam is being distributed through the service provider outbound gateway authentication standards are spawning reputation services (Habeas, Kelkea, Equifax, etc.) Service providers will need to focus on policing their subscriber base to ensure healthy reputation and successful deliverability of subscribe There is little outbound specific anti-spam protection at the sender level ─ majority of focus currently resides with inbound filtering technologies Current Market Situation

© Copyright MX Logic, Inc. All rights reserved. 9 Strictly Confidential SMTP was designed as a message transfer protocol However, SMTP is now being widely used as a message submission protocol Separating messages into submissions and transfers allows for new gateway functionality that can provide enhanced security and submission (outbound) policies Message Transfer Agent Message Transfer Agent MTA Relays to Other MTAs Port 25 Relays to Other MTAs Port 25 Message Submission Agent Message Submission Agent MSA Transfers to MTA Port 587 / 25 Transfers to MTA Port 587 / 25 Message User Agent Message User Agent MUA Submits to MSA Outlook, Eudora, Thunderbird Submits to MSA Outlook, Eudora, Thunderbird Subscriber Reputation Filtering (SRF) Submission Security Policies, Control and Identity Management Technology Overview

© Copyright MX Logic, Inc. All rights reserved. 10 Strictly Confidential Subscriber Reputation Filtering (SRF) First introduced as RFC 2476 in 1998 Allows for flexible authentication Enforces service provider AUP Enables identity management tied to SMTP transactions on a per subscriber basis Protects outbound MTA infrastructure Enables reputation-based routing Logical place for authentication signing (i.e., Domain Keys) First introduced as RFC 2476 in 1998 Allows for flexible authentication Enforces service provider AUP Enables identity management tied to SMTP transactions on a per subscriber basis Protects outbound MTA infrastructure Enables reputation-based routing Logical place for authentication signing (i.e., Domain Keys) Why an MSA?

© Copyright MX Logic, Inc. All rights reserved. 11 Strictly Confidential Subscriber Reputation Filtering (SRF) Leverages MX Logic’s MTA framework of technology Easily integrates into existing service provider messaging infrastructure as a MSA gateway Provides outbound content filtering for spam and worm originating messages Monitors a subscriber’s sending behavior to build a reputation model for outbound filtering Enables the service provider to detect account misuse with abuse trend reporting and alerts Provides subscriber notification with problem remediation instructions Can be leveraged for either consumer or business subscribers Leverages MX Logic’s MTA framework of technology Easily integrates into existing service provider messaging infrastructure as a MSA gateway Provides outbound content filtering for spam and worm originating messages Monitors a subscriber’s sending behavior to build a reputation model for outbound filtering Enables the service provider to detect account misuse with abuse trend reporting and alerts Provides subscriber notification with problem remediation instructions Can be leveraged for either consumer or business subscribers SRF Gateway Features

© Copyright MX Logic, Inc. All rights reserved. 12 Strictly Confidential Subscriber Reputation Filtering (SRF) Analogous fraud and misuse detection in the credit card, telecom and utility industries Behavior models are constructed from each individual subscriber’s sending behavior (leverages attributes such as time, size, attachments, format, mail client software) A reputation is constructed from historical sending behavior and associated message content Uses advanced algorithms such as Hellinger’s Distance to detect deviation and misuse Analogous fraud and misuse detection in the credit card, telecom and utility industries Behavior models are constructed from each individual subscriber’s sending behavior (leverages attributes such as time, size, attachments, format, mail client software) A reputation is constructed from historical sending behavior and associated message content Uses advanced algorithms such as Hellinger’s Distance to detect deviation and misuse Behavior−Based Reputation Filtering

© Copyright MX Logic, Inc. All rights reserved. 13 Strictly Confidential Subscriber Reputation Filtering (SRF) Misuse Detection Engine Real-Time Attack Recognition Network Operations Analyst Network Operations Analyst Subscriber Reputation Subscriber Reputation Message Disposition Policies Message Disposition Policies Alert on Known Attacks Alert on NEW Attacks Spam Signatures Predictive Detection Model SMTP Data SMTP Data Mining Data Mining Subscriber Activity Subscriber Activity Subscribe Profile Data Subscribe Profile Data Model Evaluation

© Copyright MX Logic, Inc. All rights reserved. 14 Strictly Confidential Subscriber Reputation Filtering (SRF) Architecture SRF Gateway sits in front of your current outbound delivery pool and filters traffic from authenticated users, building reputation and sending behavior profiles for each subscriber. Messages are filtered using the subscriber reputation, behavior profile and message content. SRF Gateway sits in front of your current outbound delivery pool and filters traffic from authenticated users, building reputation and sending behavior profiles for each subscriber. Messages are filtered using the subscriber reputation, behavior profile and message content. Subscriber Database Subscriber Database Reputation and Behavior Database Reputation and Behavior Database Radius Server Gateway Control Console Gateway Control Console SMTP XML HTTP LDAP Internet Service Provider Authenticated SMTP Gateway (MTA) Service Provider Authenticated SMTP Gateway (MTA) Subscribe (MUA) Subscribe (MUA) Subscribe (MUA) Subscribe (MUA) Subscribe (MUA) Subscribe (MUA) MX Logic SRF Gateway (MSA) MX Logic SRF Gateway (MSA) Authentication Module Authentication Module SMTP AUTH proxy SMTP AUTH proxy

© Copyright MX Logic, Inc. All rights reserved. 15 Strictly Confidential Service Provider Product Vision Own The Edge MX LOGIC THREAT MANAGEMENT SERVICES MX LOGIC THREAT MANAGEMENT SERVICES , Instant and Mobile Messaging MX LOGIC INBOUND EDGE SERVICES MX LOGIC INBOUND EDGE SERVICES Anti-Spam Anti-Virus DoS Protection Compliance Filtering Reputation Filtering Authentication Anti-Spam Anti-Virus DoS Protection Compliance Filtering Reputation Filtering Authentication SERVICE PROVIDER CUSTOMER SERVICE PROVIDER CUSTOMER Commercial Managed Services Application Hosting Domain Registration Services Appliance Services Commercial Managed Services Application Hosting Domain Registration Services Appliance Services Service Provider Messaging Infrastructure (Openwave, Sun, Critical Path) Service Provider Messaging Infrastructure (Openwave, Sun, Critical Path) MX LOGIC OUTBOUND EDGE SERVICES MX LOGIC OUTBOUND EDGE SERVICES Anti-Spam Anti-Virus DoS Protection Compliance Filtering Reputation Filtering Sender Authentication Anti-Spam Anti-Virus DoS Protection Compliance Filtering Reputation Filtering Sender Authentication Service Provider Message Store Service Provider Message Store Service Provider Managed Services Service Provider Managed Services MX Logic SRF Gateway MX Logic SRF Gateway Consumer Subscriber Consumer Subscriber Business Subscriber Business Subscriber Appliance Attached Appliance Attached Internet MX Logic Defense Gateway MX Logic Defense Gateway MX Logic Threat NOC MX Logic Threat NOC