I'm going through a re-brand at my company and we are working with new domains for our landing pages as well as our emails. We've successfully created a new landing page domain, and when I tried to use that same domain in the email setup, it didn't work.
I've been in contact with a few people (our internal IT, Marketo consultants, as well as Marketo CSM and Marketo Support) and they're all working towards a solution that involves creating a new domain for email that is different than the landing page domain. While I understand that that's the solution, I cannot seem to get a clear-plain-English answer as to why we cannot just use the same domain that we use for our landing pages as our branding domain for emails --I can't tell if it's an issue of possibility or capability.
Is it true that you cannot use the landing page domain as your email branding domain? If so, why?