Looking at Postfix 3.3 and upgrade-configuration I get:
Note: the following files or directories still exist but are
no longer part of Postfix:
/usr/local/etc/postfix/access /usr/local/etc/postfix/aliases
/usr/local/etc/postfix/canonical /usr/local/etc/postfix/generic
/usr/local/etc/postfix/relocated /usr/local/etc/postfix/transport
/usr/local/etc/postfix/virtual
All well and good, but what has replaced them, especially virtual and alias
which are a pretty basic part of my mail configuration for local users.
I looked around on postfix.org for 3.3 info and didn't stumble across it.
http://www.postfix.org/postfix-release/experimental/ didn't load anything or
show up on google searches, though I did have an old link to a page there.