MX records and multiple domains

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I want to have one server handle the distribution of incoming internet email
to the 3 exchange servers (all different domains of course) in my site.  The
exchange servers are already correct.  What's the best way to setup the MX
records in DNS?

Should I put an MX record for fooa.com in the foob.com file?

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Greg Jones
Ayden, NC
<gregjones at earthling.net>