WebAdmin 

WebAdmin, free remote administration tool, allows administrators to securely manage MDaemon 8.0 and higher, RelayFax, and WorldClient from anywhere in the world. Interface compatible with Microsoft IE, Netscape, Mozilla, Firefox, and Safari browsers.
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MDaemon 

MDaemon , Windows-based email server software, contains full mail server functionality and control with a strong emphasis on security to protect your email communication needs. Security features include Greylisting, DKIM, DomainKeys (DK), and SPF.
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VisNetic MailServer 

VisNetic Mail Server is a high performance mail server with an extensive, highly configurable feature set. This secure mail server is also ideal for use as a gateway mail server, features built-in anti spam, Web mail and an instant messaging server.
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