qpsmtpd-forkserver command not found

Introduction

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

qpsmtpd-forkserver: command not found

or when using sudo you get the following error message

sudo: qpsmtpd-forkserver: command not found

Solutions to qpsmtpd-forkserver: command not found

How To Fix qpsmtpd-forkserver: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu qpsmtpd-forkserver is provided by qpsmtpd package.

qpsmtpd is:

This is a replacement SMTP daemon which installs alongside a mail delivery and transport system such as Exim, Postfix or Qmail, or used as an SMTP proxy for a remote/DMZ MTA.

The qpsmtpd damon emphasizes spam detection during the SMTP transaction, attempting to reach spam/nonspam decisions prior to accepting each message, thereby eliminating much bounce/forgery blowback. It exploits its visbility into the network transaction to detect certain behaviors often exhibited by spam sending agents.

Qpsmtpd is written in Perl, with an extensive plugin API making it easy to add new features or replace functional components.

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

sudo apt-get -y install qpsmtpd

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

You can also use apt command to install qpsmtpd.

sudo apt -y install qpsmtpd

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

sudo aptitude install qpsmtpd

Summary

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