In this article we will walk you through the steps of installing and configuring dkim with OpenDKIM and Exim on a CentOS 7 SSD VPS.
You should have a working mail server setup with Exim before proceeding with this tutorial. Check our guide on how to set-up a mail server with Exim and Dovecot on a CentOS 7 VPS if you don’t have setup a mail server yet.
What is OpenDKIM?
OpenDKIM is an open source implementation of the DKIM (Domain Keys Identified Mail) sender authentication system which is an email validation system designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain is authorized by that domain’s administrators. A digital signature included with the message can be validated by the recipient using the signer’s public key published in the DNS.