We are looking to implement DKIM and DMARC, we already have SPF enabled and working.
I understand DKIM and DMARC to quite a good level, however one thing I do not seem to be able to find a clear answer on is implement steps, by this I mean the process of rolling this out (mainly order of DNS changes);
I guess that with DKIM, as long as its not enabled on your outgoing smarthost then you can apply the public DNS record and it is simply ignored by all as the Email header has not been modified?
However with DMARC if a DMARC record exists in your DNS, even with DKIM disabled/deactivated does the DMARC record get quried by your recipients? I have read that some companies use DMARC with only SPF so I assume the answer is Yes it does impact your Emails even with DKIM disabled.
We have a number of third parties so we are trying to align all our DKIM DNS records before activating.