Exchange2010 and send connector

This is a design question than a problem and would like an expert explain to me.
Our client has Exchange 2010 in two sites.  like Site A and B.
Users at each site uses their own CAS server to send mail out. Everything work fine.
Here is my question , How to avoid the site A mail does not go out via Site B hub transport  and Site B mail does not go out via Site A transport?
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sara2000Asked:
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
I believe Exchange uses servers in its own sites by default.
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Rezwan IslamSystems AdministratorCommented:
You can create a separate Send Connector under Hub Transport for each site and add specific CAS servers for for Site A or Site B.
Add specific CAS server to the "Source Server" tab under each Send Connector,
and under the Network tab add the site specific MTA/smart host.
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sara2000Author Commented:
Rezwan:
CAs and HUB server rolls are on one server at each. Yes, source servers are each site's CAS/HUB servers this is default. Does this mean that Site A will not send mail out via Site B so does the Site B?
there is a WAN link between Site A and Site B.
How to avoid that mail is not being routed from Site A to Site B then internet?
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