The part of the postinstall script editting the syslog.conf file actually should be a trigger script for the sysklogd package. I'll submit a patch for the spec file via e-mail. Additional change in this patch: Add the --with-sendmail=/usr/sbin/sendmail flag to configure, as sendmail is not found when the package is built when /usr/sbin is not include in the current PATH list.
Created attachment 58 [details] Patch for inn.spec file
Fixed in 2.2.2-2, which should be in the next rawhide release.