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. Features include top-notch antispam security features such as Greylisting, DomainKeys Identified Mail (DKIM), DomainKeys, SPF, Sender ID; seamless integration with AntiVirus plug-in; built-in groupware functionalities; SyncML server for PIM synchronization; and more.