smtpprox-loopprevent command not found

In this troubleshooting guide we learn how to fix smtpprox-loopprevent command not found error message

Introduction

When you run more command in linux terminal / console, you get the following error message

smtpprox-loopprevent: command not found

or when using sudo you get the following error message

sudo: smtpprox-loopprevent: command not found

In Ubuntu smtpprox-loopprevent is provided by smtpprox-loopprevent package.

smtpprox-loopprevent is:

smtpprox-loopprevent is a transparent SMTP proxy which rejects a message if any of the recipient addresses match a Delivered-To header.

It was written to be used as a Postfix before-queue filter.

To fix this problem, we can install more using the command below.

sudo apt-get -y install smtpprox-loopprevent

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install smtpprox-loopprevent.

sudo apt -y install smtpprox-loopprevent

Or if you have aptitude installed you can use the following command.

sudo aptitude install smtpprox-loopprevent

In this tutorial we learn how to fix smtpprox-loopprevent command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.