The services listed on this services take a different approach to secure e-mail by using a third party -- usually a Public Key Server -- to handle the encryption and also control how long the recipient can read the message, whether the sender gets a receipt and other security features. Some also automatically compress attachments in your messages.
For S/Mime utilities, see S/MIME Encryption and Message Security Tools
PGP add-ins are now found at PGP Encryption and Message Security Tools
Public key servers and other services are listed at Secure E-mail Services
Tools and utilities which do not fit any of the above categories are list at Encryption and Message Security Tools
Secure email gateway that sits between the mail server and firewall. Comes with a plugin for Outlook that makes it easy to send secure messagesto anyone with an Internet connection and control when they can be read. Also supports several other mail clients.
Service to provide delivery receipts, read receipts, and other tracking. Also supports self-destructing and unprintable messages and message retraction.
Secure message delivery and tracking service. SecureMail makes sending encrypted email as simple as clicking a button. Because SecureMail delivers directly to your recipient's regular inbox, retrieving a secure email is just as easy. You can point the recipient to a URL to pick up their email, or send it as a PDF file right to their inbox.
E-mail and message encryption service using a public key server, with direct Outlook integration via a free add-in. Also compresses and encrypts file attachments.
- Compression Tools -- Some of these tools can encrypt as well as compress attachments.
- Crypto Law Survey -- Encryption of e-mail is not universally legal. This site tracks encryption law around the world.
- X.400 Services
- OL2002- Exchange 2000 Account with Revoked Security Can Send and Receive E-mail
- Outlook S/MIME Vulnerability
- OL2002 Recipients Cannot Read Messages When 168-Bit (3DES) Encryption Is Enabled -- discusses UseAlternateDefaultEncryptionAlg registry value
- You Cannot Send Encrypted E-Mail Messages to a Contact While You Are Working Offline -- hotfix available for Outlook 2002
- Windows Prompts You for Your Password Multiple Times When You Use Outlook If Strong Private Key Protection Is Set to High -- hotfix available for Outlook 2002
- Quick Start for SMIME in Exchange Server 2003
- OL2002 Recipients Cannot Read Messages When 168-Bit (3DES) Encryption Is Enabled
- Signed E-Mail Message Displays the Incorrect Sending Address