550 550 relaying denied (state 14)?

Please help. I see there have been a few similar queries over the last few days, but none answered that I can see. I have had this account for 5 years, other than that's it's slow, I rarely have problems. Since last Tuesday about a 3rd of my incoming mails are being rejected. Those trying to mail me, get the... show more Please help. I see there have been a few similar queries over the last few days, but none answered that I can see.

I have had this account for 5 years, other than that's it's slow, I rarely have problems.

Since last Tuesday about a 3rd of my incoming mails are being rejected. Those trying to mail me, get the following:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient
domain. We recommend contacting the other email provider for further
information about the cause of this error. The error that the other server
returned was: 550 550 relaying denied for <XXXXXXX> (state
14).

----- Original message -----

Received: by 10.110.5.18 with SMTP id 18mr510565tie.11.1227956087019;
Sat, 29 Nov 2008 02:54:47 -0800 (PST)
Return-Path: <XXXXXXgmail.com>
Received: from AngiePC (XXXXXX])
by mx.google.com with ESMTPS id i6sm6139278tid.5.2008.11.29.02.54.44
(version=TLSv1/SSLv3 cipher=RC4-MD5);
Sat, 29 Nov 2008 02:54:45 -0800 (PST)
From: "XXXX" <XXXXXX>
To: <XXXX>
Subject: FW: Delivery Status Notification (Failure)
Date: Sat, 29 Nov 2008 18:54:38 +0800
Message-ID: <02a001c95210$e1c63ef0$a552bcd0$@com>
MIME-Version: 1.0
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AclRxpAdffXHsWOfSl+B7C8UFFGx6wASklkA
Content-Language: en-sg
x-cr-hashedpuzzle: Ad6k AlsQ AtDS A2f7 A+s6 B6mo DvGv Dxk0 EsGh Ftgw GcIK
HQtd HaA3 ITCn IeR7
KOWd;1;bABhAG8AdABzAGUAcwBhAGMAawBlAHI...
{71278F74-D4D3-4CF9-B0A5-AEBBA92F2C36}...
GMAbwBtAA==;Sat, 29 Nov 2008 10:54:35
GMT;RgBXADoAIABEAGUAbABpAHYAZQByAHkAIA...
YQB0AGkAbwBuACAAKABGAGEAaQBsAHUAcgBlAC...
x-cr-puzzleid: {71278F74-D4D3-4CF9-B0A5-AEBBA92F2C36}

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