DomainKeys Identified Mail (DKIM) is a sender authentication technology that gives your recipients the ability to verify the domain the email was sent from and assures them that the message was not altered during transfer. This can be a powerful tool that results in greater trust in your mailings.
In order to understand and get the most out of DomainKeys, we recommend that you review the DomainKeys FAQ, and then follow the link on that page to set up and use DKIM in ListManager.