The SpamBouncer is a set of procmail instructions that search the headers and text of your incoming email to see if it meets one or more of a list of conditions for probable spam. It will then either tag the suspected spam and return it to your main incoming mailbox, tag the suspected spam, delete spam from known spam sources, and file suspected spam in a separate folder, send a simulated MAILER-DAEMON daemon "bounce", complain to the "upstream providers" of known spammers or spam sites/domains, etc.
PostgreSQL is excellent!
I've been using PostgreSQL (http://www.postgresql.org/) (PgSQL) for over a year now and am highly pleased with its functionality. I have worked with other databases but appreciate the object relational nature of PgSQL. Another reason that I use PgSQL is the license, it is much less restrictive than the licenses of other (O)RDBMSs. If you're concerned about licensing, this is the database to use! Yet another quality of PgSQL is the developers continued focus on SQL92 compliance. While SQL92 compliance is not complete as of this writing, it is nearing completion at every release. I would recommend PgSQL to anyone looking for a great all purpose ORDBMS!
OpenSSL is wonderful!
I have been using the combination of Apache (http://www.apache.org/), mod_ssl (http://www.modssl.org/), and OpenSSL (http://www.openssl.org/) for about a year now. Before using OpenSSL, I used SSLeay (http://www.psy.uq.oz.au/~ftp/Crypto/) which was good in its own right but I believe that OpenSSL has a bigger and brighter future than SSLeay. OpenSSL's continued development has been aggressive, releasing bug fixes and feature updates on a regular basis. OpenSSL is easy to setup and use and compiles on a variety of systems. I would highly recommend OpenSSL to anyone wanting well done SSL support!