I sent a message to external user yesterday. And I received #521 5.7.1 error message.

My collegues tried to sent to the recipient, then it was success.

It happened same circustance before. That is why I could not understand this situation.

Now I can send a message to the recipient. I really worry what it happen aganin.

The error message is follow thing.

PLBFSP04 rejected your message to the following e-mail addresses:

recipient@zzz.com (recipient@zzz.com)<mailto:recipient@zzz.com>

PLBFSP04 gave this error:

 PLBFSP04 not accept your message (Your IP address 216.32.180.186 has been registered in SPAM Black IP List.) 

Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.

Diagnostic information for administrators:

 Generating server: bigfish.com

 recipient@zzz.com

 PLBFSP04 #521 5.7.1 PLBFSP04 not accept your message (Your IP address

 216.32.180.186 has been registered in SPAM Black IP List.) ##

Original message headers:

 Received: from mail96-co1-R.bigfish.com (10.243.78.248) by CO1EHSOBE011.bigfish.com (10.243.66.74) with Microsoft SMTP Server id  14.1.

225.23; Wed, 11 Jul 2012 23:49:59 +0000

Received: from mail96-co1 (localhost [127.0.0.1])       by mail96-co1-

R.bigfish.com

 (Postfix) with ESMTP id 92154DA01DB    for <recipient@zzz.com>; Wed, 11 Jul

2012

 23:49:59 +0000 (UTC)

X-Forefront-Antispam-Report:

CIP:111.221.112.181;KIP:(null);UIP:(null);IPV:NLI;H:HKXPRD0410HT005.apcprd04

.prod.outlook.com;RD:none;EFVD:NLI

X-SpamScore: 0

X-BigFish: PS0(z5109hzc89bhzz1202hzzz2fh2a8h668h839hd25hf0ah107ah34h)

Received-SPF: pass (mail96-co1: domain of nitco.co.kr designates

111.221.112.181 as permitted sender) client-ip=111.221.112.181; envelope- from=myaccount@aaa.com; helo=HKXPRD0410HT005.apcprd04.prod.outlook.com

;.outlook.com ;

Received: from mail96-co1 (localhost.localdomain [127.0.0.1]) by mail96-co1

 (MessageSwitch) id 1342050595572181_28639; Wed, 11 Jul 2012 23:49:55 +0000

 (UTC)

Received: from CO1EHSMHS028.bigfish.com (unknown [10.243.78.238])       by

 mail96-co1.bigfish.com (Postfix) with ESMTP id 8044A44004D     for

 <recipient@zzz.com>; Wed, 11 Jul 2012 23:49:55 +0000 (UTC)

Received: from HKXPRD0410HT005.apcprd04.prod.outlook.com (111.221.112.181) by  CO1EHSMHS028.bigfish.com (10.243.66.38) with Microsoft SMTP Server

(TLS) id  14.1.225.23; Wed, 11 Jul 2012 23:49:55 +0000

Received: from HKXPRD0410MB354.apcprd04.prod.outlook.com ([169.254.9.158]) by  HKXPRD0410HT005.apcprd04.prod.outlook.com ([10.255.7.168]) with mapi id 14.16.0175.005; Wed, 11 Jul 2012 23:52:16 +0000

From: =?ks_c_5601-1987?B?vNXB1rvz?= <myaccount@aaa.com>

To: "recipient@zzz.com" <recipient@zzz.com>

Subject: =?ks_c_5601-

1987?B?wNDAvTogRlc6IMDOtbW01rvqILHksd7A5yDA57DtILnftvW9usel?=

 =?ks_c_5601-1987?B?ILzbus4oNy8xMSk=?=

Thread-Topic: =?ks_c_5601-

1987?B?wM61tbTWu+ogseSx3sDnIMDnsO0gud+29b26x6UgvNu6zig3LzEx?=

 =?ks_c_5601-1987?Q?)?=

Thread-Index: AQHNX8Auj+sS9AkRNEWpIgYL0ohaj5ckwObm

Date: Wed, 11 Jul 2012 23:52:16 +0000

Message-ID:

<CA1CA8BAF4F4D946A07F13F0F240AE090130775E@HKXPRD0410MB354.apcprd04.prod.outl

ook.com>

Accept-Language: ko-KR, en-US

Content-Language: ko-KR

X-MS-Has-Attach:

X-MS-TNEF-Correlator:

Content-Type: multipart/report;

boundary="_000_CA1CA8BAF4F4D946A07F13F0F240AE090130775EHKXPRD0410MB354_";

        report-type=disposition-notification

MIME-Version: 1.0

Return-Path: myaccount@aaa.com

X-OriginatorOrg: aaa.com

Please, any advice.