[CentOS] No module named snack

Hi everyone--I'm back on the list after some time not managing any Centos
machines. It's good to be back.

I'm trying to switch a server from sendmail to postfix. It's Centos 4.6. I
installed postfix and system-switch-mail. When I run system-switch-mail, I
get

Traceback (most recent call last):
  File "/usr/sbin/system-switch-mail", line 89, in <module>
    main()
  File "/usr/sbin/system-switch-mail", line 76, in main
    from switchmail_tui import mainDialog
  File "/usr/share/system-switch-mail/switchmail_tui.py", line 36, in
<module>
    from snack import *
ImportError: No module named snack

"Snack" appears to be a python module provided by a package called newt,
which is installed:

# rpm -qf /usr/lib/python2.3/site-packages/snack.py
newt-0.51.6-9.rhel4

What am I doing wrong?

Thanks a lot,
Matt
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