Comment 1 for bug 378955

things went a little different for me on a fresh RC3 machine

...
Preconfiguring packages ...
Selecting previously deselected package openssl-blacklist.
(Reading database ... 28480 files and directories currently installed.)
Unpacking openssl-blacklist (from .../openssl-blacklist_0.3.3+0.4-0nexenta1.9_all.deb) ...
Selecting previously deselected package ssl-cert.
Unpacking ssl-cert (from .../ssl-cert_1.0.14-0nexenta3.2_all.deb) ...
Selecting previously deselected package postfix.
Unpacking postfix (from .../postfix_2.5.2-1nexenta3_solaris-i386.deb) ...
Adding `diversion of /usr/bin/rmail to /usr/bin/rmail.distrib by postfix'
Setting up openssl-blacklist (0.3.3+0.4-0nexenta1.9) ...
Setting up ssl-cert (1.0.14-0nexenta3.2) ...
UX: groupadd: ssl-cert name should be all lower case or numeric.

Setting up postfix (2.5.2-1nexenta3) ...
Adding group `postfix' (GID 104) ...
Done.
Adding system user `postfix' (UID 102) ...
Adding new user `postfix' (UID 102) with group `postfix' ...
Not creating home directory `/var/spool/postfix'.
Creating /etc/postfix/dynamicmaps.cf
Adding tcp map entry to /etc/postfix/dynamicmaps.cf
Adding group `postdrop' (GID 105) ...
Done.
/etc/aliases does not exist, creating it.

Postfix was not set up. Start with
  cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

anil@nexenta-vm2:~$ echo $?
0

---

Did you install other packages before postfix? This will help with reproducing the issue.

Thanks,