Apparently this is not a thing yet.
There should be a settings page to allow for users to ‘opt-in’ or ‘opt-out’ of marketing emails. Further, the types of marketing emails should be separated: In times where I was no longer playing Eve Online, if I opt out of regular Eve Online marketing emails - I know I still would have wanted to be tempted back into the game if any tempting offers came up.
Regardless, having such setting would allow me (an others) to resubscribe to marketing emails in the event that I unsubscribe from marketing emails by accident or whatever reason.