- 42inc
 - Features secure standards-based SMTP, POP, IMAP, and Webmail. - 4SecureMail.com
- Provides secure email accounts and hosting for consumers and business customers worldwide.
- Agenetics, Inc.
- Allows users to send and receive secure messages.
- CipherTrust
- Enterprise email security including anti-spam and webmail protection.
- FileFortress
- Secure, web-based email system for businesses.
- Generalmail.com
- Premium secure service for business and personal use with encryption (SSL), web based email, and IMAP/POP3 access.
- HushMail
- Web-based fully encrypted email system.
- IDseal Secure Email
- Offers end-to-end, encrypted web based email compatible with OpenPGP.
- KeptPrivate.com
- Secure web-based email service offers encrypted message storage and secure POP/IMAP and SMTP access.
- MuteMail
- Allows users to send and receive anonymous email via an SSL connection.
- Nast-E-gram
- Service that anonymously sends specified messages to recipients as email or postal mail.
- Proof of Service - electronic (PoS-e)
- Certified Internet document delivery system that provides proof of what was served, upon whom, and when.
- SafeMessage
- Provides protected communications by encrypting all communications, providing known delivery status, and auto-erasing messages.
- SecureNym
- Founded with the purpose of providing a private, anonymous email service.
- StealthMessage.com
- Secure messaging system designed for communicating sensitive and confidential information.
- Swissmail.org
- Offers secure email for business and personal use.
- VERIFY3
- Offers an email encryption, identity verification, and digital signatures system developed by Quadlogic Systems, which allows users to encrypt emails and attachments, such as accounts and databases.
- Yozons
- Offers a secure service that allows businesses to securely send, legally sign, store, and retrieve documents and messages from anywhere in the world.
- ZipLip.com
- Data exchange platform with modules for email, storage, collaboration, and payments.
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