The output below says it all! Passing to package maintainer as requested.
web01:/usr/src/postfixadmin# dpkg -i postfixadmin_2.3_all.deb
(Reading database ... 20662 files and directories currently installed.)
Preparing to replace postfixadmin 2.3 (using postfixadmin_2.3_all.deb) ...
Unpacking replacement postfixadmin ...
Setting up postfixadmin (2.3) ...
dbconfig-common: writing config to /etc/dbconfig-common/postfixadmin.conf
*** WARNING: ucf was run from a maintainer script that uses debconf, but
the script did not pass --debconf-ok to ucf. The maintainer
script should be fixed to not stop debconf before calling ucf,
and pass it this parameter. For now, ucf will revert to using
old-style, non-debconf prompting. Ugh!
Please inform the package maintainer about this problem.