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Multiple branding domain, single messaging domains, cookies and deliverability

Question asked by e6615dd679b5dd0c3e60c20085706f392a9af2cb Champion on Oct 7, 2016
Latest reply on Oct 7, 2016 by sanford.whiteman

The last version of Marketo now enables the setup of multiple email branding domains.


This means that if we have 3 domains (, and and we have also 3 messaging systems (,,, we can setup the system so that every email which sender email address is something like uses as a branding domain and any email which sender email address is something like uses as a branding domain. Assuming that my 2 web sites ( and are tracked in Marketo, I understand (pls correct me if I am wrong!) this will enable the immediate linkage between the lead who clicked the email and it's munchkin cookies on the corresponding web site, even if that person has never filled out any form.


Now, let's say I can only send email with a sender email address. In this scenario, my 2 local websites ( and are still munchkin enabled. In this case should I enable the 2 branding domains or not?


If I enable it, it means that the email will be sent from, but it will for instance contain links in redirected to Are the advantages in term of tracking better than the drawbacks if any, on deliverability? And now, what if I use trusted IP's? Dedicated IP's? (My understanding being that SPF/DKIM settings only really matter on dedicated IP's).


In other terms, in which cases I should use the multiple branding domains and in which cases I should not?


Thanks for your insights.