Domino domains are for mail routing...
Enough introduction - what is the point I want to make?
Alan writes: "Similar to how you need a Passport when travelling between two countries, two Domains need to be "cross-certified" in other to trust each other."
That statement isn't correct. Domains in Domino is, strictly speaking, a way to plan and manage mail routing. Nothing else. There is an one-to-one relationship between a Domino domain and a Domino Directory, that is a Domino Directory holds all the servers and users in the domain. Servers and users from different domains may belong to the same organization(s) and/or organizational units.
I agree there is a certain security aspect in play when deciding whether to divide your Domino infrastructure into domains but the main issue has to do with mail routing. Another has to do with deviding responsibility for managing different parts of the installation to regional IT-departments.
Cross-certification on the other hand is a cryptology term and is used for establishing trust between organizations, servers and users that does not share a common certificate. It does therefore not make sense to speak of cross-certification for Domino domains since a domain isn't a cryptology "thing". It is like comparing apples and oranges.
That's all... :-)
If you think I am wrong please let me know.





