package xmail 1.25-4 failed to install/upgrade: subprocess post-installation script returned error exit status 4

Binary package hint: xmail

A long list of already existing files in the synaptic console, when installing. After checking, a couple of files had an old date, so I can account for at least a few files being already there (bad un/install?).

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 9.04
ErrorMessage: subprocess post-installation script returned error exit status 4
Package: xmail 1.25-4
SourcePackage: xmail
Title: package xmail 1.25-4 failed to install/upgrade: subprocess post-installation script returned error exit status 4
Uname: Linux 2.6.28-13-generic i686