CommuniGate Pro is an Internet Messaging Server (ESMTP, IMAP4rev1, POP3, Web e-mail) that takes full advantage of modern multithreaded and multiprocessor environments and includes antispam protection, administration via the Web, extensive multi-domain support, dial-up capabilities, and unique IMAP multi-mailbox features. It is optimized for many platforms, including Apple Mac OS X Server,Windows NT/9x, Linux, Sun Solaris, and FreeBSD. It is also designed to provide access to hundreds of thousands of accounts while still being easy on resources and setup demands.