Might be related to http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=654971
** Bug watch added: Debian Bug tracker #654971
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=654971
** Also affects: amavisd-new (Debian) via
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=654971
Okay, this bug can be closed. my pardon.
It was caused because I had modified the user to vmail instead of amavis.
Root cause was that the user amavis didn't have +wx-Permission on vmail's
.spamassassin-directory.
Anyway: if ubuntu would have used the newer version of /usr/sbin
