I have a question on Adobe sub domain configuration and one of the requirements is related to email masking i.e. e.g. If we delegate domain email.abc.co.nz but at the same time for some of the campaigns we would want to send few comms that shows email of relationship manager which means sender address shows firstname.lastname@example.org (parent domain) rather than email@example.com. Though this can be achieved by email masking but I have few questions to clarify:
If you are configuring multiple domains in your wizard setting then those can be used as sender domains.
As you stated, it is possible to do personalized sender, and it doesn't break anything.
The email header will show up as firstname.lastname@example.org as configured within the delivery.
hope this helps.