SecExMail Gate is an email proxy server which encrypts and decrypts messages on your corporate network in real-time. This proxy server integrates with your existing corporate infrastructure and operates in conjunction with your SMTP/POP3 mail server. SecExMail Gate implements open standard encryption algorithms to create a seamless security framework to protect the privacy of your corporate email on the public internet. No additional software on the e-mail workstations on your network is required.
This software is a commercial software. You will be able to download and test SecExMail Gate during a certain period of time, then, if it does what you need, you will have to acquire the full version from SecExMail Gate publisher. The SecExMail Gate 1.2 free trial version contains an installer and an uninstaller, and has a size of 3024 Kilobytes.
For additional information and support request, please contact directly SecExMail Gate publisher.

SecExMail Gate Screenshot