I just added a second domain to my exchange 2010 server using these instructions
I used the powershell version.
Now the new domain is considered the primary domain.
I tested everything with MXtoolbox.com and all of the DNS stuff basically correct. I am getting
Warning - Reverse DNS does not match SMTP Banner
Warning - Does not support TLS.
The first one requires a reverse mx record created by my ISP, not sure how to fix the TLS support issue..But more importantly, when i send a mail to the primary domain, i get this response back
#550 5.1.1 RESOLVER.ADR.RecipNotFound
; not found ##
When i send an email to the secondary domain, they don't get rejected.
When i view the messages in OWA, the TO: shows it was sent to the primary domain even thought the messages was actually sent to the secondary domain.