Multiple Domino Mail Domains Question

Hi,We have the following setup when it comes to multiple Domino Mail domains:

Organization = ORG1 (such as /IBM)

Domino MailDomain1 = Domain1 within ORG1

Domino MailDomain2 = Domain2 within ORG1

To get email working between the two Domains, we have setup Directory Assistance / Directory Catalog as well as connection documents between the various domains. Everything is working perfectly - users can perform lookups and email is working fine between the domains and the internet.

Just wondering if the above is a typical setup that large companies would implement in their Domino mail system (that is having multiple uniquely named domains within a top level organization)

Thanks…Baljeet