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All mail to yahoo.com is being instantly deferred

From: Patrick - South Valley Internet (patrickmgarlic.com)
Date: Fri Jun 01 2007 - 21:39:57 CDT

Hi all,

Okay I'm at a wits end with this thing. Over the past 2-3 weeks every
single e-mail that is being sent through our mail server that goes to a
yahoo.com address is being deferred.

Here is an example e-mail (with email addresses changed for security
reasons):

---------------------------------------------------------------------
Jun 1 04:46:50 sequoia postfix/qmgr[39184]: CA1A93EA6:
to=<blahxxxblahyahoo.com>, relay=none, delay=126544, status=deferred
(delivery temporarily suspended: host c.mx.mail.yahoo.com[216.39.53.3]
refused to talk to me: 421 Message from (216.139.0.84) temporarily
deferred - 4.16.50. Please refer to
http://help.yahoo.com/help/us/mail/defer/defer-06.html)
---------------------------------------------------------------------

I've already went to that URL, filled out the form, then Yahoo! directs
me to a cgi mailer form to fill out with all my information, our mail
servers, the error, etc. then sends me to another form that is for bulk
mailers. We are an ISP not a bulk mailer. And what's worse, they keep
sending me in the same runaround. I've mentioned all of this
information in great detail to them but it seems like they don't give a
damn. Or maybe I'm just not getting connected to the right people.
It's like they don't even want to help me fix the problem.

I was just wondering if anyone else has experienced this issue and has
any insight on this. Your help is much appreciated.

We are running postfix 2.1.3.

Patrick