Postfix is an alternative to the widely-used Sendmail program.Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible.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 ...