DKIM Not Working On AlmaLinux 9 with CWP

INTRODUCTION

If DKIM signature isn’t working or showing when sending emails.

Make sure you have your DKIM TXT file in the DNS.
If it is, and DKIM still isn’t showing, the below will probably fix the error with CWP on AlmaLinux 9.

READ ME FIRST

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Installing, configuring, and troubleshooting third-party applications is outside the scope of basic support provided by Starburst Services.
We are not liable for any damages and/or data loss.

REQUIRMENTS

  • SSH credentials or File Manager access Logged In as Root
  • Text editor of your choice. (The example uses nano)

PROCEDURE

STEP 1

Make sure OpenDKIM and OpenDKIM-Tools are installed:

dnf install opendkim opendkim-tools

STEP 2

Make sure OpenDKIM is Started & Enabled at startup:

systemctl start opendkim
systemctl enable opendkim

STEP 3

Now that you’ve made sure OpenDKIM is installed and running, it’s time to implement Postfix DKIM.
Let’s follow the Postfix OpenDKIM configuration process.

Edit Postfix main configuration file:

nano /etc/postfix/main.cf

Add the following lines at the end of the “main.cf” file, if they are missing:

smtpd_milters = inet:127.0.0.1:8891
non_smtpd_milters = $smtpd_milters
milter_default_action = accept

Save and close the file.

STEP 4

Restart OpenDKIM and Postfix:

systemctl restart opendkim
systemctl restart postfix

Now, you’ve configured OpenDKIM with Postfix on AlmaLinux 9.

Send a test email using a test site like mail-tester.com

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KB Article Written: 2024-08-20

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