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PTR레코드 등록 되어있고, 한메일, 네이버, 다음 다 이상없는데

핫메일만 저런데 어떤 이유가 있을까요

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>> Received: from mail2.webdive.co.kr (1.234.27.212)
>> by webdive.co.kr (1.234.27.212) with [Nmail V3.8 20071121(ST)]
>> for <****@****>from <****@****>;
>> Thu, 28 Mar 2013 11:15:44 +0900
>> From: =?ks_c_5601-1987?b?wKW02cDMuuo=?= <****@****>
>> Subject: =?ks_c_5601-1987?b?uN7Az8XXvbrGrg==?=
>> To: ****@****
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>> X-Mailer: SM
>> Date: Thu, 28 Mar 2013 11:15:43 +0900
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