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Subject: Send error 501 Unknown Command HELO dongbo.com <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Error Message : 501 Unknown Command HELO dongbo.com [****@****]

-- You SendMail --

>> Received: from LocalHost (61.39.65.197)

>> by dongbo.com (200.20.10.79) with [Nmail V3.820071121(ST)]

>> for <****@****> from <****@****>;

>> Tue, 11 Jun 2013 14:54:34 +0900

>> From: =?ks_c_5601-1987?B?udrB2Lyu?= <****@****>

>> To: <****@****>

>> Subject: =?ks_c_5601-

1987?B?KMHWKbW/urggsObB1rD4wOUgvNK55sjGt8O9w7OquK6/wCC827rO?=

>> =?ks_c_5601-1987?B?sMc=?=

>> Date: Tue, 11 Jun 2013 14:54:57 +0900

>> Message-ID: <003401ce6668$345d3a40$9d17aec0$@dongbo.com>

>> MIME-Version: 1.0

>> Content-Type: multipart/mixed;

>> boundary="----=_NextPart_000_0035_01CE66B3.A4472C30"

>> X-Mailer: Microsoft Outlook 14.0

>> Thread-Index: Ac5maAZuP2LgQx2ySdC0QkJAzk0Uww==

>> Content-Language: ko

▷ 질문내용 :  위와 같은 리턴메시지가 오는데 이유가 뭘까요?