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거래처에서 독일로 메일을 여러번 보냈는데

다음과 같은 메일이 계속 리턴되어 온다고합니다

-----Original Message-----
From: g2sysnet.com PostMaster [mailto:****@****]
Sent: Monday, March 23, 2009 1:49 PM
To: ****@****
Subject: Send error 450 4.7.1 Client host rejected: cannot find your hostname, [222.237.79.xxx]

Error Message : 450 4.7.1 Client host rejected: cannot find your hostname,
[222.237.79.xxx] [****@****]

-- You SendMail --

>> Received: from RyanKimPC (61.32.65.x)
>>  by g2sysnet.com (222.237.79.xxx) with [Nmail V3.8  20071121(ST)]
>>  for <xxxx@interplan.de> from <xxxx@allmedicus.com>;
>>  Mon, 23 Mar 2009 13:47:08 +0900
>> From: "Ryan Kim" <xxxx@allmedicus.com>
>> To: <xxxx@interplan.de>
>> Subject: EASD 2009
>> Date: Mon, 23 Mar 2009 13:46:55 +0900
>> Message-ID: <019a01c9ab72$64b4c600$2e1e5200$@com>
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