Postfix Email Relay by Domain

I have a Mailscanner box I am using as a frontend to Exchange.  One of the domains I host uses MX-Logic to scan inbound and also as a smart-host.  I realize that in Exchange 2010 I can create a transport rule that would forward outbound mail from those users directly to MX Logic for delivery.  I do like to use the Mailscanner to troubleshoot mailflow as its interface is better than Exchange.

Is there a code I can put in the postfix config like "relayhost =" that would seperate by outgoing domains?
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If you want to direct mail to a certain smarthost, based on the senders email address, then read this

Normally transport maps work on the destination address, but as of postfix 2.7, you can now do it based on sender address instead.

so in a hash file it would be   smtp:[]

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Create an empty file to contain all of the domains and smart hosts
vi /etc/postfix/transport

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Insert a line for ech domain that you wish to redirect. Once complete run the below command
postmap /etc/postfix/transport

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Now open etc/postfix/ and enter the line
transport_maps = hash:/etc/postfix/transport

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Save the file and run
postfix reload

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Alan HardistyCo-OwnerCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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