CommuniCrypt Mail Standalone POP3/SMTP eMail client with built-in strongest asymmetric Public-Key-Encryption with RSA encryption algorithm (RSAES-OAEP).Key length for encrypting up to 7120 bit.
Mailtraq Mailtraq is a complete email server with SMTP IMAP POP3 Webmail and LDAP server that runs on ordinary Windows systems. Mailtraq provides Calendar and Contact sharing for User collaboration.