unrouteable mail delivery???

I am having more mail problems than USPS, FEDEX, UPS put together unrouteable mail delivery??? LOL (joking)

Anyway, for every outgoing mail from my billing system ModernBill I'm getting this error (but it seems to be server side not internally in the software)

This is an example:

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:

user@yahoo.com
unrouteable mail domain "yahoo.com"

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

Return-path: <sales@mydomain.com>
Received: from nobody by server.mydomain.com with local (Exim 4.43)
id 1CldbA-0000BT-6F; Mon, 03 Jan 2005 20:35:00 -0500
To: "Customer" <email@yahoo.com>
Subject: My Company :: Payment Reminder
MIME-Version: 1.0
From: sales@mydomain.com
X-Priority: 3
X-Mailer: ModernBill
Content-Type: multipart/alternative;
boundary="=_3bb3694ed525869bf90bbc1dbb0e9679"
Message-ID: <i9rr2c.ar0393@mydomain.com>
Date: Mon, 03 Jan 2005 20:35:00 -0500

--=_3bb3694ed525869bf90bbc1dbb0e9679
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit

I have cPanel/WHM. In WHM's tweak settings, I have max emails per domain per hour set to 0 (default unlimited). I have "pop3 prevent floood..." off, "prevent user nobody from sending ...." off.
Spam assassin is off too. What else?

specs:
centos 3.3
cpanel 9.9.9 r-14
exim 4.3.4

 

 

 

 

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