Cannot figure out this via SFDC documentation. Need someone who have setup this before to advise.
Basically we want to enable DKIM for our SFDC org. In testing Sandbox and production, the from email address is using the same email domain. For example, "firstname.lastname@example.org" for sandbox and "email@example.com" in production.
Question: shall we setup DKIM in both sandbox and production or just need to setup in production since sandbox and production are actually using the same domain "abc.com"?