こんにちは
いつも大変便利に使わせていただいています。

4/1昼前から、突然特定ドメインからのメールが届かなくなってしまいました。
3/29までは同じアドレスからいくつも受信しています。
送信、及び別ドメインからの受信には問題ありません。

送信側にのみ、数時間後に次のようなエラーメッセージが届いています。
とても不便なので、解消方法がありましたら教えていただけると大変助かります。
よろしくお願いいたします。
**********************************************
** THIS IS A WARNING MESSAGE ONLY **
** YOU DO NOT NEED TO RESEND YOUR MESSAGE **
**********************************************

The original message was received at Mon, 1 Apr 2013 22:02:05 +0900
from FLH1●●●●●.tky.mesh.ad.jp [220.144.146.●●●]

----- Transcript of session follows -----
... while talking to mx.zenno.net.:
>>> DATA
<<< 451 4.3.5 Server configuration problem
<●●●●@sheep.dog.cx>... Deferred: 451 4.3.5 Server configuration problem
<<< 421 4.7.0 mgw2.zenno.net Error: too many errors
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

---------------

Reporting-MTA: dns; sd012.just-size.net
Arrival-Date: Mon, 1 Apr 2013 22:02:05 +0900

Final-Recipient: RFC822; ●●●●@sheep.dog.cx
Action: delayed
Status: 4.3.5
Remote-MTA: DNS; mx.zenno.net
Diagnostic-Code: SMTP; 451 4.3.5 Server configuration problem
Last-Attempt-Date: Tue, 2 Apr 2013 02:14:43 +0900

------------------

Return-Path: <MAILER-DAEMON@sd012.just-size.net>
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by sd012.just-size.net (8.13.8/8.13.8)
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Tue, 2 Apr 2013 02:14:43 +0900
Received: from sd012.just-size.net ([112.78.200.173])
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Received: from localhost (localhost)
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Tue, 2 Apr 2013 02:14:43 +0900
Date: Tue, 2 Apr 2013 02:14:43 +0900
From: Mail Delivery Subsystem <MAILER-DAEMON@sd012.just-size.net>
Message-Id: <201304011714.r31HEe2Z017935@sd012.just-size.net>
To: <△△△△@lix.jp>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status; boundary="r31HEe2Z017935.1364836483/sd012.just-size.net"
Subject: Warning: could not send message for past 4 hours
Auto-Submitted: auto-generated (warning-timeout)
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