Just wondering if Shadow Redundancy is something people always see as useful. I can see it being useful if you have multiple edge transports transporting email across internal 2010 servers across different sites, but with a simple single site with 2 hub transport servers, am I right in assuming that shadow redundancy will offer no benefit as the mailbox servers will just email the hub directly and the hub transports do not email each other?
Only the transport dumpster can help in this case as the route is:
Mailbox server -> HUB server -> External SMTP mail filter (not Exchange)