BigPond - Mail from your ISP is temporarily rejected due to DNS Block List

I've been trying to send mail to people who have Bigpond.com email addresses and received the following message concerning the unable to deliver the emails. For some reason, Mac.com is being seen as a spam address and is currently blocked.
Who at Mac.Com can following the instructions below to resolve the problem which are relatively straight forward, but it's not a specific mac issue, but their mail servers
Anybody through any light on how to get Mac.com to investigate the problem?
----- Transcript of session follows -----
... while talking to extmail.bigpond.com.:
MAIL From:<[email protected]> SIZE=318276
<<< 451 Mail from your ISP is being temporarily rejected due to a DNS block list. Your ISP can resolve this issue. More information is here <a class="jive-link-external-small" href="http://">http://bigpond.custhelp.com/cgi-bin/bigpond.cfg/php/enduser/stdadp.php?pfaqid=12829
<[email protected]>... Deferred: 451 Mail from your ISP is being temporarily rejected due to a DNS block list. Your ISP can resolve this issue. More information is here http://bigpond.custhelp.com/cgi-bin/bigpond.cfg/php/enduser/stdadp.php?pfaqid=12829
Warning: message still undelivered after 4 hours
Will keep trying until message is 4 days old

Reporting-MTA: dns; smtpoutm.mac.com
Arrival-Date: Sun, 30 Sep 2007 03:12:48 -0700 (PDT)
Final-Recipient: RFC822; [email protected]
Action: delayed
Status: 4.3.0
Diagnostic-Code: SMTP; 451 Mail from your ISP is being temporarily rejected due to a DNS block list. Your ISP can resolve this issue. More information is here http://bigpond.custhelp.com/cgi-bin/bigpond.cfg/php/enduser/stdadp.php?pfaqid=12829
Last-Attempt-Date: Sun, 30 Sep 2007 08:07:49 -0700 (PDT)
Will-Retry-Until: Thu, 4 Oct 2007 03:12:48 -0700 (PDT)

Resolving such issues can be complex. It is important to recognize that you've done nothing wrong.
The bounces occur because your ISP has chosen to subscribe to a blocking list maintained by one of several such services. In your case, BigPond is querying the Trend Micro MAPS RBL list each time it receives inbound smtp transactions, and for some reason, addresses or address ranges assigned to .Mac mail for such traffic have been added to this MAPS RBL.
BigPond can do nothing, really, but sever its link to MAPS, and is highly unlikely to do so. Beyond reporting the issue to Apple as indicated above via .Mac support using the web form located here, there is really nothing you can do. It is up to MAPS to remove the block based upon a request from Apple.
This sort of relative stupidity occurs quite frequently. We have chosen to use the services of spamhaus.org to limit SPAM on our internally operated mail server, and face the same issue with mail originating through domains maintained by T-Mobile, who has unfortunately found themselves on the Spamhaus PBL, or policy block list. I haven't been able to locate someone at T-Mobile responsible for resolving the issue, so mail originating outside our domain via T-Mobile HotSpots or the T-Mobile cellular data network—traffic that is legitimately relayed through our server to users outside our subnet—is blocked.
While I generally applaud the efforts of SPAM blocking services like MAPS and Spamhaus, I am beginning to believe that the unintended consequences of their services negate the value they otherwise provide. And, they operate with impunity and are unwilling to talk to affected users or notify sanctioned providers on behalf of affected users. They simply add the offending addresses to their many block lists, and leave it to others to correct what they see as a violation.

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