What makes Postfix really nice as a replacement for sendmail is the fact that you can seamlessly and transparently replace sendmail using the same files you're already used to, making migration easy. Postfix supports the /var/mail/ filesystem, /etc/aliases, /etc/access, NIS, NetInfo and ~/.forward files, read more..
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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