/usr/share/doc/amavisd-new-postfix/changelog.Debian.gz is in amavisd-new-postfix 1:2.7.1-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/amavisd-new-postfix/../amavisd-new/changelog.Debian.gz