!Nmail Send error Invalid server address

["sena.co.kr PostMaster" <NmailServer@xxxxxxxxxx>]

Error Message : Invalid server address

-- You SendMail --

>> Received: from oss.sgi.com (218.152.122.62)
>>      by sena.co.kr (218.152.164.33) with [Nmail V3.3 20021108(S)]
>>      for <oz@xxxxxxxxxxxxxx> from <netdev@xxxxxxxxxxx>;
>>      Tue, 10 Feb 2004 17:17:53 +0900
>> From: netdev@xxxxxxxxxxx
>> To: oz@xxxxxxxxxxxxxx
>> Subject: test
>> Date: Tue, 10 Feb 2004 17:16:58 +0900
>> MIME-Version: 1.0
>> Content-Type: multipart/mixed;
>>      boundary="----=_NextPart_000_0008_1E5D2B03.0DCDD954"
>> X-Priority: 3
>> X-MSMail-Priority: Normal