This kerberized popper was based on popper-1.831beta
which was later announced as "offical" and not beta.

Please note that the server principal is pop.hostname and not
rcmd.hostname. I.e an additional entry is needed in your mailhub's
/etc/srvtab. Use ksrvutil and kadmin to add the extra prinicpal.

The server is usually started from inetd and there is already an entry
for that in inetd.conf.changes.