This guide will show you how to install and configure the OpenDKIM on your centos 6.5 and Ubuntu server. Before we start, I would just like to put out from the wiki what DKIM is. Just in case anyone doesn't know.
http://en.wikipedia.org/wiki/DomainKeys_Identified_Mail Wrote:DomainKeys Identified Mail (DKIM) 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.
First things first, we always need to ensure our system is up to date. So lets do that first. (This guide also assumes that you are not using the root account, that you are using another account, that can get root permissions.
CentOS
Code:
sudo Yum update