MailSite Mail Server - Version 4.5.4 MailSite is an Internet Mail and List Server for Windows NT and 2000. It allows your computer to communicate with other mail servers on the Internet to send and receive e-mail. It is fully compliant with Internet mail standards and implements the SMTP, POP3, LDAP3, and IMAP4 specifications.MailSite now supports multi-server clustering, web-based email, sieve filters, and WAP!