Encryption

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Try: HushMail free or premium web-based encrypted web-mail accounts.
or Hushmail Private Label (or Hush Identity for smaller businesses to manage their own e-mail accounts with their domain name) "is a Web-based, totally secure, email outsourcing solution. With Private Label, you can offer visitors to your site the convenience of Web-based email protected by Hush's encryption technology."

Please note that this page does not address protecting e-mail (or other files) already on your system from being read or copied. This page addresses encryption and digital signing of e-mail messages and attachments to be sent to others.

Yahoo's Security and Encryption category

Contents:

• Purposes of encryption/security
• PGP (Pretty Good Privacy)
• GnuPG
• S/MIME (Secure MIME)
• Comparison of PGP and S/MIME
• Key Servers and Server Products
• Other secure e-mail systems

Purposes of encryption/security:

• Encryption: encrypts the message so that only the recipients can decrypt the message. Thus if a message is intercepted, it can't be read.
• Signing: you can "digitally sign" your message, which means that your encryption/security program puts code in the message such that the person at the other end can verify that you were the person who actually composed and sent the message.
• With PGP or S/MIME packages, you can choose to encrypt, sign, or do both (or neither).
• Cryptography HowTo by Michael Pedersen and Greg Wooledge

Comparison of PGP and S/MIME:

• Internet Mail Consortium's take on S/MIME and PGP/MIME
  
• S/MIME vs. PGP (requires Acrobat Reader) (disclaimer: this is put out by Worldtalk, makers of an S/MIME product)

Other secure e-mail systems:

• Document Exchange from UPS
• Confidential Courier from Digital Delivery. If I read the description correctly, you encrypt files onto media such as disks or CDs, send the media via traditional shipping methods, but you e-mail or otherwise send the key that decodes the files.
• HushMail free or premium web-based encrypted web-mail accounts.
• Hushmail Private Label (or Hush Identity for smaller businesses to manage their own e-mail accounts with their domain name) "is a Web-based, totally secure, email outsourcing solution. With Private Label, you can offer visitors to your site the convenience of Web-based email protected by Hush's encryption technology."
• iSend by PitneyBowes
• PosteCS from USPS
• Tumbleweed IME
• ZixMail for Windows can be used with any MIME-compliant desktop e-mail client and many web mail sites. The recipient need not have Zixmail.
• Other encryption schemes:
  • InvisiMail uses RPK encryption (also has editions which support PGP, S/MIME, and RPK) and also has anti-virus and anti-spam features. (Windows)
  • Fairly Good Privacy for Macintosh, by Vaporware.

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