How To Install postfwd2 on CentOS 8

One-liner Install Command

If you are only interested in the installation command, here is a quick answer for you:

sudo yum makecache && sudo yum -y install postfwd

sudo dnf makecache && sudo dnf -y install postfwd

But if you are interested in the details with step-by-step instructions, the following information will be helpful.

What is postfwd2 and How to Install It?

First things first, you will need access to a server or computer running CentOS 8. This guide was written specifically with a server running CentOS 8 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 CentOS 8. 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 on CentOS 8 using dnf

First, update dnf packages database with dnf by running the next command:

sudo dnf makecache --refresh

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

sudo dnf -y install postfwd

Install postfwd2 on CentOS 8 using yum

Because postfwd2 is available in CentOS 8’s default repositories, it is possible to install it from these repositories using the yum packaging system.

To begin, update local packages database with yum using the following command.

sudo yum makecache --refresh

Now can install postfwd2 package on your server/computer by running the following command:

sudo yum -y install postfwd

How to upgrade (update) a single package postfwd2 using yum?

To update all the packages available on the system:

yum update

If you want to update a specific package like postfwd2 in this example you should use the following command:

yum update postfwd

To downgrade a package to an earlier version:

yum downgrade postfwd

How to Upgrade postfwd2 on CentOS 8 with dnf?

When you run the dnf update, all system packages with available updates are updated. However, if you want to upgrade a single package, then you would have to pass the package name as the argument to the dnf update command.

dnf update postfwd

How To remove postfwd2 from CentOS 8

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

sudo dnf remove 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 dnf and yum package managers. Also, we showed how to update manually as a single package and different ways to uninstall the postfwd2 from CentOS 8.

See also: