ぜんの様

お世話になっております。
最近友人が携帯を変えたのですが、以降PCから彼女の携帯（Docomo）にメールを送ろうとするとFailure Noticeとなります。
携帯（私はエッジ）から送ると問題なく届きます。何故なのでしょうか。
以下にNoticeをコピーしておきます。ちなみにXXXは友人のアドレス、XXXXXは私の、そしてOOOOOは私の名前が入っていた部分です。
解決法をお教えください。お願いします。
Hi. This is the qmail-send program at ns2.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 XXX

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

Return-Path:
Received: (qmail 24206 invoked by uid 7794); 26 May 2004 22:25:22 +0900
Received: from XXXXX by ns2.zenno.net by uid 7791 with qmail-scanner-1.16
( Clear:.
Processed in 0.135955 secs); 26 May 2004 22:25:22 +0900
Received: from unknown (HELO ?219.179.138.11?) (219.179.138.11)
by ns2.zenno.net with SMTP; 26 May 2004 22:25:22 +0900
User-Agent: Microsoft-Outlook-Express-Macintosh-Edition/5.0.6
Date: Wed, 26 May 2004 22:25:25 +0900
Subject: =?ISO-2022-JP?B?GyRCRk8kJCQ/JGghKhsoSg==?=
From: OOOOO
To: =?ISO-2022-JP?B?GyRCOWIxShsoSiAbJEI3QztSGyhK?=

Message-ID:
Mime-version: 1.0
Content-type: text/plain; charset="ISO-2022-JP"
Content-transfer-encoding: 7bit

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