Global Groups/ Universal Groups query

Hi

We are running in a multidomain forest.

Domain root is company.com, and child domains are uk.company.com, us.company.com and aus.company.com. For Exchange, we have 3 Admin groups to mirror this, each with their own mailbox servers etc.

In the UK domain we have created a mail enabled Global security group, GroupA.

There is a server in the US that sends an email to GroupA, but the mail is never delivered to the recipients, although there is no NDR.

I have a couple of questions I was hoping someone could help me with;

a) If the server in the US sends the email to the US Exchange server, then am I correct in thinking that the US Exchange will contact the US DC about this group, and the US DC won't have any knowledge of it?

b) We have been creating mail enabled security groups in general rather than distribution groups. Is there actually any advantage to creating distribution groups?

c) Am I correct in thinking that we should generally create global groups unless there is a requirement for the groups to be used in the other domains? Universal groups create extra replication traffic?

Urgent, so max points.
LVL 3
kam_ukAsked:
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dan_blagutCommented:
kam_ukAuthor Commented:
Thanks...I've read it and similar but am still confused ;)

Will the global group replicate between domains, and will the group membership replicate too?
dan_blagutCommented:
Hello again,

"Global groups are containers for user accounts and computers accounts in the domain, and are used to assign permissions to objects that reside in any domain in a tree or forest."
So this group can't be used in other domains - > it will be not replicated.

"Universal groups: Universal groups can have user accounts, computer accounts, global groups, and other universal groups, from any domain in the tree or forest as members. This basically means that you can add members from any domain in the forest to a universal group"
This group is replicated interdomains and you have a option named "enable universal group membership caching " that serve for reducing the replication timing in the universal group membership replication.

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