Before getting to the specifics of installing the supporting software for each MTA, we first cover the installation of SpamAssassin. If SpamAssassin is installed first, several of the packages will automatically determine that SpamAssassin has been installed and adjust their configuration.
The first step is to download the sources, which are available from the SpamAssassin site: http://useast.spamassassin.org/released/Mail-SpamAssassin-2.63.tar.gz. After you have downloaded them to a location such as /usr/local/src, uncompress and extract the files as follows:
bash$ gzip -d Mail-SpamAssassin-2.63.tar.gz bash$ tar xf Mail-SpamAssassin-2.63.tar.gz bash$ cd Mail-SpamAssassin-2.63
To install SpamAssassin, perform the following: ...