Load balancing outgoing mail with 3 outgoing servers

We are trying to balance our mail out with 3 separate mail servers from our incoming server. Our organization sends alot of mail and we wanted to balance it with 3 outgoing SMTP servers. We have them all working, in the zone for the primary DNS and incoming mail server. And we can get mail to go out on the three servers, BUT and this is a problem if the mail includes any messages to the network (hence the incoming server) then the SMTP servers complain they cannot find it and give a error message about not being able to connect to deliver any local mails out of the bulk mail we send. Any ideas how to get the SMTP to see the incoming mail server (which is the DNS server for network) and deliver mail to accounts on the network? Maybe we are doing something that OS X SNL server cannot do? Any ideas.
I will post the error message later but I need to leave for meeting for now.
Thanks
Russ

Here is error message we get:
Mar 17 21:34:45 mailout1 postfix/smtp[32307]: connect to mail.vineyardil.net [173.161.44.97]:25 Operation timed out
Mar 17 21:34:45 mailout1 postfix/smtp[32307]: DE90A1AF591: to =<[email protected]>, relay=none, delay=23732, delays=23701/0.01/30/0, dsn4.4.1, status=deferred (connect to mail.vineyardil.net [173.161.44.97]:25 Operation timed out)
To explain mailout1 is the first one in priority of outgoing separate SMTP servers we set up in the zone of mail.vineyardil.net which is the DNS server. They send out ok all outgoing mail to other addresses as we wanted them (rather than having mail.vineyardil.net do it) but when we send to an address with vineyardil.net on it then we get this same message.
It seems like mailout1 cannot send to the incoming server. Note the ip address it gives is the ip of the cable modem on this network not the ip address locally in the net we have.
Our MX records all look good and things work with mail if we use it both as incoming and outgoing (SMTP) but when we use the secondary servers for outgoing they seem to not be able to send to this server. Is there something we should look for?
Is SL server not capable of what we are trying? Any feedback would be most appreciated. We would like to really use this setup as I explained to do load balancing of mail as part of our attempt on this new network to get our bulk mailing split up between the 3 outgoing servers so we will not be labeled spam by the security systems out there these days like it was on our old network.
Thanks for your time.
Russ Jacobson

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/* Style Definitions */
table.MsoNormalTable
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([email protected])

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IÂ´ve searched Metalink and found note 268830.1: Webcache Won't Load Balance 2 Forms Instances.
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Added these lines at the end of HTTPD.conf (machine B):
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