Links are included to a Debian package and the latest Slackware .tgz. Since Balsa includes a spell-checking component, you should also have ispell and pspell on your system. If you decide build from source, you should also be aware that though Balsa works well with a default configuration, there are a few features still tagged as optional or experimental. This way you can get a look at the filtering configuration, even though this feature isn't done and won't work. If you're moving to Balsa from another mail client and have a set of preexisting mail files elsewhere, this is an important thing to keep in mind.
Balsa also sets up specific inbox, outbox, trash, and sentbox folders.
Other options in the Druid include setting your mail address and SMTP host. In addition to the basic configuration the Druid offers, Balsa has a wide variety of configurable options from within the program itself. It's possible to add POP accounts, set which headers you can see when displaying a message, adjust how messages are colorized for attribution when displayed, and add address books. Balsa allows aliases to auto-expand when entering a recipient in the 'To' field of a new mail, as well. By right-clicking on the index entry of a message, addresses can be added directly to the default address book.