Email Security 5.261 is available as a free download on our software library. The actual developer of the program is Ixis Ltd. SMTPServerGUI.exe is the default file name to indicate this program's installer. The software lies within Communication Tools, more precisely E-mail Tools. The most popular version among Email Security users is 3.1.
From the developer:
When you send email messages, Internet Service Providers (ISP) usually store the messages on their mail servers before they try to deliver them. This can be a major risk for you because your relevant information can be viewed and printed on that end, and someday used against you. There is only one safe way to avoid it, is to send email messages directly to recipient mailboxes without leaving any traces on the Internet.
You may want to check out more software, such as Barracuda Email Security Gateway Outlook Add-In, Secure Medical HIPAA Email or Quick Heal Internet Security, which might be similar to Email Security.