Courier packages at debian.linuxia.de are updated now, you don't need
... and this brings up related question: does anyone know of a deb
repository with a recent stand-alone version of maildrop? The
"courier-maildrop" package in the linuxia repository is indeed up to
date, but it's meant to be part of a larger courier-mta installation.
The stand-alone "maildrop" package in the Debian "stable" repositories
is version 1.5.something, which is very much out of date.
I recommend to use courier-maildrop and look only for maildrop if you
run into troubles. For my specific purpose (calling maildrop from
Exim4) it works fine. There might be a newer maildrop in experimental.