The 3.5.0.0 version of SecureMessenger is available as a free download on our website. The actual developer of the free software is AntraSoft. The program lies within Communication Tools, more precisely Instant messaging.
From the developer:
AntraSOFT Secure Messenger is a stand alone email program which provides end-to-end security for highly confidential information communicated via electronic mail using security public & private 1024-bit key (security certificate) and POP3/SMTP protocol.
You may want to check out more software, such as South Park Theme Pack for Messenger, TapiRex Plugin: Solutio Charly or Simpsons Theme Pack for Messenger, which might be similar to SecureMessenger.