MDaemon is Windows-based email server software, contains full mail server functionality and control with a strong emphasis on security to protect your email communication needs. Features include top-notch antispam security features such as Greylisting, DomainKeys Identified Mail (DKIM), DomainKeys (DK), SPF; seamless integration with AntiVirus plug-in; built-in groupware functionalities; secure instant messaging; free webmail client; and more.