Outbound email routing based on sending domain.

We currently have several exchange servers in our exchange environment hosting email for several domains. We have 3 different spam filters each one for a separate domain scanning inbound email then forwarding to exchange. curently exchange is sending outbound email directly to the internet.

We would like outbound email to be sent through the correcct spam filterr based on the sending domain. i understand that Exchange is not able to do this. Does anyone have another way of routing this outbound email? Maybe another peice of software on the FrontEnd server, or maybe another server with software that handles the routing.
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Have you considered adding a smtp connector?
csandlinAuthor Commented:
We currently have one SMTP Connector pointing all outgoing mail to a smart host that we would like to decommission.
In its place we have 3 new smart hosts each one handling a different domain name.
PAQed with points refunded (450)

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