greylistd-setup-exim4 command not found

Introduction

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

greylistd-setup-exim4: command not found

or when using sudo you get the following error message

sudo: greylistd-setup-exim4: command not found

Solutions to greylistd-setup-exim4: command not found

How To Fix greylistd-setup-exim4: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu greylistd-setup-exim4 is provided by greylistd package.

greylistd is:

This daemon provides a simple greylisting implementation for use with the Exim Mail Transport Agent (MTA), version 4.

Once installed, you will need to configure your MTA to query the greylistd server. This package contains a script to automatically configure Exim 4. It may be possible to use greylistd with other MTAs as well. Postfix users may want to check out the “postgrey” package instead of this one.

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

sudo apt-get -y install greylistd

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

You can also use apt command to install greylistd.

sudo apt -y install greylistd

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

sudo aptitude install greylistd

Summary

In this tutorial we learn how to fix greylistd-setup-exim4 command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.