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Sounds like you need a Postfix relay/gateway.
That would certainly offload a lot of SMTP traffic to the Postfix machine, and
if you find you get a ton of deferrals you can setup another Postfix machine to
only handle deferred mail. Len has information on his site to immediately
get started using FreeBSD or you can check out the documentation that is coming
for RedHat 7.1 on www.postfixgate.com
when it is available.
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