CPAN

It has been a while since How to Install a CPAN Perl Module and things have changed a little bit. The qpsmtpd Download page recommends running

# perl -MCPAN -e shell

This will again go through a configuration wizard, but now you have to answer 'no' to get the full run-down:

CPAN is the world-wide archive of perl resources. It consists of about
300 sites that all replicate the same contents around the globe. Many

Trivial for those who know, but there's a first time for everything.

[EDIT: See Installing CPAN Perl Modules Revisited for a newer take.]

Here's how to install a module from CPAN:

perl -MCPAN -e 'install full::module::name'

The first time you run this, it will answer with