I have read multiple posts here that describe a similar situation, but not one answers my specific need.
I have 2 email domains. Primary xxxx.com and Secondary 1111.com
Both are Accepted Domains.
I can send and receive for both domains.
The primary email address associated to all but ONE person is the primary domain email address.
I unchecked use email policy on that user and set his primary email to be the secondary domain 1111.com
I have 2 different external ips that point to each of these email domains.
My issue is this.
When the 1111.com person sends an email, it shows up just fine with the secondary email address but the message header shows to come from the primary mx record.