受信は出来るのですが、急に送信できなくなりました。
↓↓エラメです。

Hi. This is the qmail-send program at mail2b.zenno.net.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<＊＊＊＊@＊＊＊＊>:
203.138.180.112 failed after I sent the message.
Remote host said: 550 Unknown user malboro12@docomo.ne.jp

--- Below this line is a copy of the message.

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Processed in 0.132868 secs); 28 Feb 2008 22:36:18 +0900
Received: from unknown (HELO 192.168.1.11) (219.114.96.34)
by mail2b.zenno.net with SMTP; 28 Feb 2008 22:36:18 +0900
MIME-Version: 1.0
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Date: Thu, 28 Feb 2008 22:34:21 +0900
X-Mailer: PostPet for Windows ver. 3.38 [Win32/ja_JP]
To: ＊＊＊＊@＊＊＊＊
From: ＊＊＊＊@＊＊＊＊ (=?ISO-2022-JP?B?GyRCJGYkJiRqGyhC?=)
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