Ubuntu

[2008-11: New installation on 10.3/8.6.0]
[2007-04: Implementing SMTP Authorization with qpsmtpd running under SuSE 10.0 and Plesk 8.0
[2014-01: Here's an update to these instructions.]
[2018-09: Update #2 on Installing qpsmtpd on Xenial, completely replaces 2014-01]

[2008-11: New installation on 10.3/8.6.0]
[2007-04: Implementing SMTP Authorization with qpsmtpd running under SuSE 10.0 and Plesk 8.0
[2014-01: Here's an update to these instructions.]
[2018-09: Update #2 on Installing qpsmtpd on Xenial, completely replaces 2014-01, replaced by the following]

Note: If you need LESS just for Drupal, see Install the LESS CSS Preprocessor for Drupal.

Some posts, like Ubuntu installation directions for fresh web-server recommend something like


sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install nodejs
sudo ln -s /usr/bin/nodejs /usr/bin/node
sudo apt-get install npm
sudo npm install -g less
node –v
npm -v


This is an update to my original instructions for installing qpsmtpd on a Linux system running under Plesk.

Just in case you don't have cc yet:

apt-get install build-essential


qpsmtpd is now on GitHub

qpsmtpd's README mentions installing the following "required Perl modules"

perl -MCPAN -e 'install Net::DNS'
perl -MCPAN -e 'install MIME::Base64'