We currently have an Exchange 2010 DAG across 2 sites, each site has separate internet and the sites are connected with separate switched ethernet. Both sites also have CAS/HUB and an Edge server. One challenge with 2010 is that I can't have automatic failover of outbound email because Exchange won't send inter-site. For example, if my internet at Site A goes out, I would like email to go something like: OutlookClient > HUB A --> HUB B > Edge B.
Is there anything new in Exchange 2013 that allows this, or some type of feature that accomplishes the same net result?