How To Install postgrey on CentOS 7
Introduction
In this tutorial we learn how to install postgrey on CentOS 7.
What is postgrey
Postgrey is a Postfix policy server implementing greylisting. When a request for delivery of a mail is received by Postfix via SMTP, the triplet CLIENT_IP / SENDER / RECIPIENT is built. If it is the first time that this triplet is seen, or if the triplet was first seen less than 5 minutes, then the mail gets rejected with a temporary error. Hopefully spammers or viruses will not try again later, as it is however required per RFC.
We can use yum or dnf to install postgrey on CentOS 7. In this tutorial we discuss both methods but you only need to choose one of method to install postgrey.
Install postgrey on CentOS 7 Using yum
Update yum database with yum using the following command.
sudo yum makecache
After updating yum database, We can install postgrey using yum by running the following command:
sudo yum -y install postgrey
Install postgrey on CentOS 7 Using dnf
If you don’t have dnf installed you can install DNF on CentOS 7 first.
Update yum database with dnf using the following command.
sudo dnf makecache
After updating yum database, We can install postgrey using dnf by running the following command:
sudo dnf -y install postgrey
How To Uninstall postgrey on CentOS 7
To uninstall only the postgrey package we can use the following command:
sudo dnf remove postgrey
References
Summary
In this tutorial we learn how to install postgrey on CentOS 7 using yum and dnf.
