How many Postfix installs have you had on the machine? Perhaps
different parts (proxymap, postmap) come from different versions.
Some maintainers have software installed in /usr/sbin etc., some
under /usr/local/sbin or even under /opt, and they all expect to
have main.cf in different placess.
If you use postmap from one kit and proxymap from a different
one, then no amount of main.cf tweaking will make things work.
With Postfix versions 2.4 and later, commands such as:
% strings /usr/sbin/postmap|grep mail_version=
will "fingerprint" the executable file.
Wietse
