I have the following config.;

1 Regional DOMAIN and 1 POST OFFICE.

3 Headquarters Domains and 1 Post Office under each Domain.

... So ...

If a user in the Region sends an email to 3 user (on the 3 different HQ Post Offices) ... do 3 separate messages/packets come across the network ? Or is it only split up once it arrives in HQ ?

I ask this because in HQ, we're consolidating and will only have 1 mail Domain. So I was wondering if the network traffic drops by 2/3 rds. ?????