pgl4rbl implements a Postfix policy server that mixes two widely used techniques: greylisting and RBL (DNS blacklists). The idea is that greylisting is applied only to SMTP clients that match a RBL; this means that normal clients are not delayed (such as with a normal greylisting implementation), and RBL false positives do not cause problems (like when outright blocking them at the SMTP level).
Reconfigure is a Python library for parsing and generating a range of configuration file formats. It creates an object mapping for the config file content. Supported configs include Ajenti, BIND9 DNS, Crontabs, Samba CTDB, ISC DHCPD / uDHCPD, NFS /etc/exports, /etc/fstab, /etc/group, /etc/hosts, iptables-save dump, Netatalk afp.conf, NSD DNS, /etc/passwd, /etc/resolv.conf, Samba, Squid 3, and Supervisord. Parsers are also provided for file formats including .ini, CSV, nginx-like, and JSON.