horde e-mail will not send

I am having a problem with e-mail sending on my horde account fixed to my website.I cannot send any mail:it is all returned to me as undeliverable.Even my site hosts do not know what the problem is?This has been going on for over 2 weeks.
 
Hi,

- what else does it say in the error?

- is your domain MX records configured all right? Send a Private Message with the e-mail in question.

- does it send via Outlook?
 
its important to see the full error reported by the return message.
And also the mailbox name, to check the mx records are configured ok.
 
Here is the full report.This happens to all e-mail addresses:
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:

[email protected]
unrouteable mail domain "yahoo.co.uk"

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

Return-path: <[email protected]>
Received: from cpanel by smart1.onesmartcompany.com with local (Exim 4.52)
id 1EEE0V-0004uM-U1
for [email protected]; Sat, 10 Sep 2005 15:39:35 -0700
Received: from 82.38.120.46 ([82.38.120.46]) by smart1.onesmartcompany.com
(Horde MIME library) with HTTP; Sat, 10 Sep 2005 23:39:35 +0100
Message-ID: <[email protected]>
Date: Sat, 10 Sep 2005 23:39:35 +0100
From: [email protected]
To: [email protected]
Subject: hi
MIME-Version: 1.0
Content-Type: text/plain;
charset=ISO-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 7bit
User-Agent: Internet Messaging Program (IMP) H3 (4.0.3)

hi
 
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