How To Install and Configure DKIM with Postfix on Debian Wheezy

How To Install and Configure DKIM with Postfix on Debian Wheezy

How To Install and Configure DKIM with Postfix on Debian Wheezy

In this tutorial, we will walk you through the process of installing and configuring DKIM with Postfix on Debian Wheezy. DKIM (DomainKeys Identified Mail) is a method of email authentication that allows the recipient to verify that the email was sent by the domain it claims to be from and that it has not been tampered with during transmission.

Prerequisites

  • A server running Debian Wheezy
  • Root access to the server
  • A valid domain name

Step 1: Install OpenDKIM and Required Packages

First, update your system and install OpenDKIM and required packages:

sudo apt-get update
sudo apt-get install opendkim opendkim-tools

Step 2: Configure OpenDKIM

Edit the OpenDKIM configuration file:

sudo nano /etc/opendkim.conf

Add the following lines to the configuration file:

Domain yourdomain.com
KeyFile /etc/opendkim/keys/yourdomain.com/private.key
Selector default

Create the directory for the DKIM keys:

sudo mkdir /etc/opendkim/keys

Change the ownership of the directory to the opendkim user:

sudo chown opendkim:opendkim /etc/opendkim/keys

Generate the DKIM key:

sudo opendkim-genkey -b 2048 -d yourdomain.com -s default

Change the ownership of the key:

sudo chown opendkim:opendkim /etc/opendkim/keys/yourdomain.com/private.key

Edit the OpenDKIM startup script:

sudo nano /etc/default/opendkim

Change the following line:

SOCKET="local:/var/run/opendkim/opendkim.sock"

To:

SOCKET="inet:12345@localhost"

Save and exit the file.

Step 3: Configure Postfix

Edit the Postfix configuration file:

sudo nano /etc/postfix/main.cf

Add the following lines to the configuration file:

milter_protocol = 6
milter_default_action = accept
smtpd_milters = inet:localhost:12345
non_smtpd_milters = inet:localhost:12345

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