How To Install postgrey on Kali Linux

Introduction

In this tutorial we learn how to install postgrey on Kali Linux.

What is postgrey

postgrey is:

This package provides a policy server for Postfix to implement “greylisting”.

Greylisting is a spam filtering method that rejects email from external servers on the first try. Spammers don’t usually retry sending their messages, whereas legitimate mail servers do.

While Postgrey is designed for use with Postfix, it can also be used with Exim.

There are three methods to install postgrey on Kali Linux. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.

Install postgrey Using apt-get

Update apt database with apt-get using the following command.

sudo apt-get update

After updating apt database, We can install postgrey using apt-get by running the following command:

sudo apt-get -y install postgrey

Install postgrey Using apt

Update apt database with apt using the following command.

sudo apt update

After updating apt database, We can install postgrey using apt by running the following command:

sudo apt -y install postgrey

Install postgrey Using aptitude

If you want to follow this method, you might need to install aptitude on Kali Linux first since aptitude is usually not installed by default on Kali Linux. Update apt database with aptitude using the following command.

sudo aptitude update

After updating apt database, We can install postgrey using aptitude by running the following command:

sudo aptitude -y install postgrey

How To Uninstall postgrey on Kali Linux

To uninstall only the postgrey package we can use the following command:

sudo apt-get remove postgrey

Uninstall postgrey And Its Dependencies

To uninstall postgrey and its dependencies that are no longer needed by Kali Linux, we can use the command below:

sudo apt-get -y autoremove postgrey

Remove postgrey Configurations and Data

To remove postgrey configuration and data from Kali Linux we can use the following command:

sudo apt-get -y purge postgrey

Remove postgrey configuration, data, and all of its dependencies

We can use the following command to remove postgrey configurations, data and all of its dependencies, we can use the following command:

sudo apt-get -y autoremove --purge postgrey

Dependencies

postgrey have the following dependencies:

• adduser
• debconf
• libberkeleydb-perl
• libnetaddr-ip-perl
• libnet-dns-perl
• libnet-server-perl
• perl
• ucf
• debconf

References

• postgrey website

Summary

In this tutorial we learn how to install postgrey package on Kali Linux using different package management tools: apt, apt-get and aptitude.