a mail-enabled Universal Security Group: allToronto is created and all users of Toronto are members of the group.
The VPN between Toronto and Vancouver is constantly busy.
When users in Vancouver send e-mail to the allToronto group, some recipients receive the messages after several minutes, but other recipients receive it several hours later.
Solution:
Creating a routing group A in Toronto and a routing group in Vancouver.
Placing EXCH1, EXCH2, EXCH3 and EXCH4 in routing group A. Place EXCH5 and EXCH6 in routing group B.
Creating connectors to send messages between the two routing groups.
Reason:
When sending messages to a distribution group in one routing group configuration, the exchange server will send the message directly to individual member of the group. Microsoft recommends to create routing groups configuration between exchange servers when you have slow or unreliable link. When routing groups are created, group membership expansion will occur at the destination exchange server.
