DynFX MailServer 4.0 is a powerful SMTP-, POP3- and IMAP4-Server for Windows NT 4.0, 2000, XP, Server 2003, Vista and Server 2008. With its support for multiple domains, aliases and filters as well as its scalability for extreme requirements it is ideal for ISPs but also for small businesses due to its slim and resourcesaving architecture. During its development, the focus was set on an exact implementation of the Internet-standards (RfCs) 2821, 1425, 1651, and 1939. Hence DynFX MailServer is fully compatible to the protocols SMTP, ESMTP, POP3 and IMAP4.