[plug] Domains blocking mail from dialup pools

[Timothy White]

Unfortunately it has come to my attention that some domains/mail servers 
block mail from known dialup pools.[1] One such domain is mail.com which 
I tried to send a message to recently. I use my own SMTP server rather 
than Optus as I trust mine more than Optus and it allow me to send mail 
when I am not connected through an Optus connection (as Optus only allow 
relay from local address.)
How can I get Exim4 to send messages to the mail.com domain through the 
optus SMTP server with out all my mail going through it?
Thanks
Tim
[1]
-------- Original Message --------
Subject: 	Mail delivery failed: returning message to sender
Date: 	Thu, 04 Nov 2004 06:54:32 +0800
From: 	Mail Delivery System <Mailer-Daemon at linmedia.white.lan>
To: 	weirdo at tigris.org

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  ###@mail.com
    SMTP error from remote mailer after RCPT TO:<###@mail.com>:
    host mail-com.mr.outblaze.com [205.158.62.72]:
    554 EMail from mailserver at 203.213.143.160 is refused. See http://spamblock.outblaze.com/203.213.143.160

------ This is a copy of the message, including all the headers. ------

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Tim White
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