I would like to ask, how am I be able to place the list-unsubscribe on the DomainKeys? And what would be the format for that, because right now, we only have the k= and p= value. We don’t have the q=, d=, s=, h=, and b=…
Thanks for writing! You should be able to just include the List-Unsubscribe header normally. Ideally, it would be after the Domain Keys header so that the List-Unsubscribe header is signed as well.