How To Install postfwd2 on Ubuntu 21.04

In this guide, we’ll discuss How To Install postfwd2 on Ubuntu 21.04. Also, we will demonstrate how to uninstall and update postfwd2.

One-liner install command

For those in a hurry, here's a one-line installation command:

sudo apt-get update && sudo apt -y install postfwd

But if you are interested in the detailed steps with descriptions, the following information is for you.

What is postfwd2 and what are the ways to install it?

Before beginning this tutorial, you will need access to a server or computer running Ubuntu 21.04. This guide was written specifically with a server running Ubuntu 21.04 in mind, although it should also work on older, supported versions of the operating system.

Also, make sure you are running a regular, non-root user with sudo privileges configured on your server. When you have an account available, log in as your non-root user to begin.

There are several ways to install postfwd2 on Ubuntu 21.04. You can use (links are clickable):

In the following sections, we will describe each method in detail. You can choose one of them or refer to the recommended one.

Install postfwd2 using apt-get

First, update apt database with apt-get using the following command.

sudo apt-get update

After updating apt-get database, You can install postfwd2 using apt by running the following command:

sudo apt -y install postfwd

Install postfwd2 using apt

Because postfwd2 is available in Ubuntu 21.04’s default repositories, it is possible to install it from these repositories using the apt packaging system.

To begin, update apt database with apt using the following command.

sudo apt update

After updating apt database, You can install postfwd2 using apt by running the following command:

sudo apt -y install postfwd

Install postfwd2 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 21.04. Update apt database with aptitude using the following command.

sudo aptitude update

After updating aptitude database, You can install postfwd2 by running the following command:

sudo aptitude -y install postfwd

How to upgrade (update) a single package postfwd2 using apt-get?

First, you will need to update packages index. Run update command as usual:

sudo apt-get update

Next, to upgrade only the postfwd2, e.g. single package, you should use the following format with the apt-get command/apt command:

sudo apt-get --only-upgrade install postfwd

Note that this command will not install any new packages! If you wish to install the package if it doesn't exist you may leave out --only-upgrade part.

How To Uninstall postfwd2 from Ubuntu 21.04

To uninstall only the postfwd2 package you can execute the following command:

sudo apt-get remove postfwd

Uninstall postfwd2 and all its dependencies

To uninstall postfwd2 and its dependencies that are no longer needed by Ubuntu 21.04, you can use the command below:

sudo apt-get -y autoremove postfwd

Remove postfwd2 with all configurations and data

To remove postfwd2 configuration and data from your system you can run the following purge command:

sudo apt-get -y purge postfwd

Remove postfwd2 completely (configurations, data and all of its dependencies)

And lastly, you can run the next command to remove absolutely everything related to postfwd2 package, e.g.: configurations, data and all of its dependencies. Just use this command:

sudo apt-get -y autoremove --purge postfwd

Extra info and code examples

Postfwd is written in perl to combine complex postfix restrictions in a ruleset similar to those of the most firewalls. The program uses the postfix policy delegation protocol to control access to the mail system before a message has been accepted. It allows you to choose an action (e.g. reject, dunno) for a combination of several smtp parameters (like sender and recipient address, size or the client's TLS fingerprint).

Conclusion

You now have a full guide on how to install postfwd2 using apt, apt-get and aptitude tools. Also, we showed how to update as a single package and different ways to uninstall the postfwd2 from Ubuntu 21.04.

See also:

How To Install postfwd2 on CentOS 8

How To Install postfwd2 on Ubuntu 22.04

How To Install postfwd2 on Ubuntu 21.04

How To Install postfwd2 on Kali Linux

How To Install postfwd2 on Debian 11

How To Install postfwd2 on Fedora 34

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