Supported environments
Postfix runs on AIX, BSD, HP-UX, IRIX, LINUX, MacOS X, Solaris,
Tru64 UNIX, and other UNIX systems. It requires ANSI C, a POSIX.1
library, and BSD sockets. See below for the gory details of what
Postfix expects from the file system.
Gory details: the Postfix mail queue requires that (1) the file
system can rename a file to a near-by directory without changing
the file's inode number, and that (2) mail is safely stored after
fsync() returns successfully, even when that file is renamed to a
near-by directory at some later point in time. Maildir delivery
also requires that (3) a file can be hard linked between different
near-by directories. Mailbox delivery introduces no additional
requirements beyond what is already needed for Postfix queues.
Main features
The following is a list of major Postfix features. Some features
require third-party libraries (examples: LDAP, SQL, TLS). Other
features are available only when the necessary operating system
support exists and Postfix knows how to use it (examples: IP version
6, connection caching).
Protocol support
Junk mail control
Database support
Mailbox support
Address manipulation
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