SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free.
CDB
cdb is a fast, reliable, simple package for creating and reading constant databases. It's used by a variety of programs on this mail server, notably the validrcptto patch.
Download and upack the tarball:
cd /extra/src
wget http://cr.yp.to/cdb/cdb-0.75.tar.gz
tar xzf cdb-0.75.tar.gz
cd cdb-0.75
This command fixes "the errno problem" with glibc 2.3 and newer:
sed -i '/extern int errno/{s/^/\/* /;s/$/ *\//;G;s/$/#include <errno.h>/;}' error.h
Make and install the programs:
make setup check
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Credits
Various bits of code, scripts, and procedures were put together with information from John Simpson's qmail.jms1.net website. It's an excellent resource on managing and setting up a Qmail server.