Routing issue between two satellites sites and one central hub

Hi,
I have 3 Ad sites with one exchange 2010 hub,cas,mailbox server on each sites.
One of this site (site A) is central Hub and the two other sites  ( B and C) are two satellites of site A.
The is no connectivity between site B and C, only connectivity between A and B, and A and C.
When I send a mail from Site B to Site C, Exchange try to deliver the mail directly to site C and don't pass to site A to deliver to site C, some mail stay in queue in site B, and the the queue is in retry.
I flag the site A as HUB.
Site toplogy is correct and the cost too.
Can someone help me??
Thanks

what are your AD costs between A, B and C?
In Exchange 2010, each message recipient is always associated with only one Active Directory site, and there is only one least cost routing
from the source Active Directory site to the destination Active Directory site
 If the least-cost routing path to the primary site contains any hub sites, the message must be
routed through the hub sites

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