Install and integrate DKIM with OpenDKIM and Postfix on a CentOS 6

UPDATE THE SYSTEM

Before going any further, make sure you’re in a screen session and your system is fully up-to-date by running:

## screen -U -S opendkim-screen
## yum update

ENABLE EPEL REPOSITORY

OpenDKIM is available in the EPEL repository, so we need to enable it on the system before we can install OpenDKIM

## wget -P /tmp http://mirror.pnl.gov/epel/6/i386/epel-release-6-8.noarch.rpm
## rpm -Uvh /tmp/epel-release-6-8.noarch.rpm
## rm -f /tmp/epel-release-6-8.noarch.rpm

INSTALL OPENDKIM

Install the package using yum:

## yum install opendkim

CONFIGURE OPENDKIM

Next thing to do is to configure OpenDKIM. Its main configuration file is located in /etc/opendkim.conf, so before making any changes create a backup and add/edit the following: Continue reading “Install and integrate DKIM with OpenDKIM and Postfix on a CentOS 6” »

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OpenDKIM Postfix SMTP Relay Server on Debian -7

Install OpenDKIM

Before starting the installation, a system update is recommended:

sudo apt-get update
sudo apt-get dist-upgrade

Install OpenDKIM and it’s dependencies:

sudo apt-get install opendkim opendkim-tools

Additional packages will be listed as dependencies, type yes and press Enter to continue.

Configure OpenDKIM

A couple of files must be created and edited in order to configure OpenDKIM.

Nano will be used as an editor because it’s installed by default on DigitalOcean droplets and it’s simple to operate:

navigate with the arrow keys
exit without saving changes: press CTRL + X and then N
exit and save changes: press CTRL + X and then Y, and finally press Enter
Important: replace every instance of example.com with your own domain in all commands and configuration files. Don’t forget to save your files after editing.

Let’s start with the main configuration file: Continue reading “OpenDKIM Postfix SMTP Relay Server on Debian -7” »

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