How To Install milter-greylist on Ubuntu 20.04
Introduction
In this tutorial we learn how to install milter-greylist
on Ubuntu 20.04.
What is milter-greylist
milter-greylist is:
milter-greylist is a stand-alone milter written in C that implements the greylist filtering method, as proposed by Evan Harris.
Greylisting works by assuming that unlike legitimate MTA, spam engines will not retry sending their junk mail on a temporary error. The filter will always temporarily reject mail on a first attempt, and to accept it after some time has elapsed.
If spammers ever try to resend rejected messages, we can assume they will not stay idle between the two sends (if they do, the spam problem would just be solved). Odds are good that the spammer will send a mail to an honey pot address and get blacklisted in several real-time distributed black list before the second attempt.
There are three methods to install milter-greylist
on Ubuntu 20.04. We can use apt-get
, apt
and aptitude
. In the following sections we will describe each method. You can choose one of them.
Install milter-greylist Using apt-get
Update apt database with apt-get
using the following command.
sudo apt-get update
After updating apt database, We can install milter-greylist
using apt-get
by running the following command:
sudo apt-get -y install milter-greylist
Install milter-greylist Using apt
Update apt database with apt
using the following command.
sudo apt update
After updating apt database, We can install milter-greylist
using apt
by running the following command:
sudo apt -y install milter-greylist
Install milter-greylist Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude
using the following command.
sudo aptitude update
After updating apt database, We can install milter-greylist
using aptitude
by running the following command:
sudo aptitude -y install milter-greylist
How To Uninstall milter-greylist on Ubuntu 20.04
To uninstall only the milter-greylist
package we can use the following command:
sudo apt-get remove milter-greylist
Uninstall milter-greylist And Its Dependencies
To uninstall milter-greylist
and its dependencies that are no longer needed by Ubuntu 20.04, we can use the command below:
sudo apt-get -y autoremove milter-greylist
Remove milter-greylist Configurations and Data
To remove milter-greylist
configuration and data from Ubuntu 20.04 we can use the following command:
sudo apt-get -y purge milter-greylist
Remove milter-greylist configuration, data, and all of its dependencies
We can use the following command to remove milter-greylist
configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge milter-greylist
References
Summary
In this tutorial we learn how to install milter-greylist
package on Ubuntu 20.04 using different package management tools: apt
, apt-get
and aptitude
.