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아웃룩에서 메일를 발송시 IP name lookup failed [203.246.16.138] 에러 메시가 발송됩니다.

그리고 php로 메일링서비스를 할때
관리자 메일로 data null에러 메일 발송되고요
에러 내용은

-----Original Message-----
From: gretec.or.kr PostMaster [mailto:****@****]
Sent: Thursday, May 15, 2003 5:36 PM
To: ****@****
Subject: !Nmail Send error Data Null


Error Message : Data Null

-- You SendMail --

>> Received: from localhost (203.246.16.138)
>> by gretec.or.kr (203.246.16.138) with [Nmail V3.2 20020608(E)_T]
>> for <****@****> from <****@****>;
>> Thu, 15 May 2003 17:09:58 +0900
>> MIME-Version: 1.0
>> From: "=?ISO-8859-1?Q?=BF=EE=BF=B5=C0=DA?="<****@****>
>> To: ****@****
>> Subject: =?ISO-8859-1?Q?=B1=E8=B9=CE=BC=AE?= =?ISO-8859-1?Q?=B4=D4?=, =?ISO-8859-1?Q?2003=B3=E2?= =?ISO-8859-1?Q?05=BF=F9?= =?ISO-8859-1?Q?15=C0=CF?= =?ISO-8859-1?Q?=C0=DA?= GRETeC =?ISO-8859-1?Q?=BC=D2=BD=C4=C0=D4=B4=CF=B4=D9?=.
>> Content-Type: text/html; charset="EUC-KR"
>> Content-Transfer-Encoding: quoted-printable

관리자 메일로 timeout error 에러 메일 발송되고요
에러 내용은

-----Original Message-----
From: gretec.or.kr PostMaster [mailto:****@****]
Sent: Thursday, May 15, 2003 5:35 PM
To: ****@****
Subject: !Nmail Send error Timeout error


Error Message : Timeout error

-- You SendMail --

>> Received: from localhost (203.246.16.138)
>> by gretec.or.kr (203.246.16.138) with [Nmail V3.2 20020608(E)_T]
>> for <****@****> from <****@****>;
>> Thu, 15 May 2003 17:09:18 +0900
>> MIME-Version: 1.0
>> From: "=?ISO-8859-1?Q?=BF=EE=BF=B5=C0=DA?="<****@****>
>> To: ****@****
>> Subject: =?ISO-8859-1?Q?=B1=E8=B9=CE=BC=AE?= =?ISO-8859-1?Q?=B4=D4?=, =?ISO-8859-1?Q?2003=B3=E2?= =?ISO-8859-1?Q?05=BF=F9?= =?ISO-8859-1?Q?15=C0=CF?= =?ISO-8859-1?Q?=C0=DA?= GRETeC =?ISO-8859-1?Q?=BC=D2=BD=C4=C0=D4=B4=CF=B4=D9?=.
>> Content-Type: text/html; charset="EUC-KR"
>> Content-Transfer-Encoding: quoted-printable

그리고 1000통발송시 70통정도가 에러 가 발생합니다.