gld - GreyListing Daemon for postfix
       gld [-c <n>|-h|-v]
       gld is a policy daemon for postfix 2.1 or higher. It’s written in C and
       uses MySQL for the database stuff.
       -c     clean the database for entries older than <n> days
       -v     display version
       -h     display Usage
       /etc/gld.conf
              Configuration file.
       Please read /usr/share/doc/postfix-gld/README.Debian.
                                   June 2004