- Postini
 - Protects corporate networks and service providers from spam. - Blue Security
- Develops innovative solutions to spam and spyware based on their Do-Not-Disturb Registry approach.
- SafeIT
- Offers email and file encryption software as well as file shredding software.
- Sigaba
- Makers of SigabaSecure, secure email for individual users and corporations.
- Authentica, Inc.
- Provider of content security software for protecting and controlling valuable e-mail messages, documents, and web pages even after they're delivered to recipients.
- Hush Communications
- Offers managed security solutions and encryption key-serving technology.
- Ciphire Labs
- Software that encrypts and decrypts email messages, and can digitally sign each message to provide authentication and guard against identity theft.
- Email-policy.com
- Offers information on how to create a company email policy and enforce it with email security software. Includes sample email policies.
- SafeMessage
- Provides protected communications by encrypting all communications, providing known delivery status, and auto-erasing messages.
- Zix Corporation
- Provider of secure messaging services for corporate email and other electronic messages. Formerly known as ZixIt Corporation.
- Omniva Policy Systems
- Providing encryption, authentication, proof of delivery/tracking, and deletion, or self-destruct, capabilities to users of standard email products and services. Formerly Disappearing, Inc.
- Yozons
- Offers a secure service that allows businesses to securely send, legally sign, store, and retrieve documents and messages from anywhere in the world.
 Post.Trust
- Secure email network with Safemail, providing open-model PKI, digital signatures, and encrypted communication. Email Security and Secure Email With SafeZone
- Allows you to share business documents rapidly and securely, using smartcard technology.- MailedSAFE
- Enhancement tool providing email encryption using a system that provides automatic key management.
- Treasure Coast Software
- Global provider of email personal information containment software.
- Cupid
- Programme used in conjunction with a regular email client to facilitate secure communication between two users.
- OutBox
- Delivers policy-based email security for organisations using Microsoft Exchange and Outlook.
- SedfaSoft
- SedfaSoft encrypted email software prevents unauthorized email messages and safeguard from identity theft and other phising scams.
- CenturionMail
- Security programme for encrypting email as well as files and folders.
- DataMotion
- Provide hosted governance services for data integration and collaboration for exchange of secure documents and secure email through encryption and privacy compliance service (SaaS). Protects SMB and enterprise customers in privacy-regulated fields including insurance, healthcare, banking, finance and government agencies.
- MX Police Corporate Managed Anti-Spam Protection
- Provides managed email security and anti-spam filtering for small and medium organisations.
- UnsubCentral
- Datran Media offers advertisers and affiliates UnsubCentral global CAN-SPAM suppression list management solutions.
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