Press Release

Port25 Among First to Integrate Yahoo's DomainKeys Email Authentication Technology

Port25 Demonstrates Commitment to Make it Easy for Senders to Adopt the Latest Anti-Spam Standards

Ellicott City, MD May 24, 2004 - Port25 Solutions Inc., a leading provider of e-mail delivery software, announces that it has successfully integrated DomainKeys support into PowerMTAT, its intelligent e-mail delivery gateway product. Yahoo's (NASDAQ: YHOO) DomainKeys is a cryptographic authentication system that allows receivers of email to verify the identity an email sender and will help combat common spamming techniques. Port25 is the first company to announce its implementation of the current DomainKeys specification. Organizations interested in evaluating PowerMTA and/or learning more about our support for DomainKeys should visit http://www.port25.com/domainkeys.

"Being among the first to support DomainKeys demonstrates our commitment to sender accountability. We are one of the few companies that is attacking the spam problem from the send side by making it easy for senders to comply with the latest policies and protocols", said Juan Altmayer Pizzorno, CTO of Port25.

Port25's PowerMTA already provides several features to make it easier for legitimate companies and email service providers to ensure accountability and compliance with anti-spam policies. The result is less email delivery hassle, greater peace of mind and improved delivery rates. Examples of these features include: real-time delivery statistics, delivery volume throttling, support for virtual MTA's and Habeas Sender Warranted Email.

According to Anne P. Mitchell, Esq., President and CEO, Institute for Spam and Internet Public Policy, "Restoring trust in email and improving deliverability requires a multipronged strategy. Specialized email delivery products - like Port25's PowerMTAT- that help senders comply with the latest policies are an important part of an effective anti-spam strategy for both enterprises and email service providers."

About Port25 Solutions, Inc.
Port25 Solutions, Inc. provides specialized e-mail infrastructure software products that address the unique demands of customer communications and e-mail marketing applications. PowerMTAT, Port25's flagship product, provides the intelligence, control and performance required to maximize delivery in today's environment. Port25 customers include leading email service providers (including Responsys, Silverpop, Socketware and WhatCounts) and large enterprises (including Travelocity, Mary Kay Cosmetics and Creative Labs Inc.). For more information, please visit www.port25.com.

Port25 and PowerMTA are trademarks of Port25 Solutions, Inc.