发往一个域名的邮件总是退信（目前只发现这一个域名退信），请大家帮忙分析一下，先谢谢，（这个邮箱是老板经常发的）。

以下是退信内容：(yao@111.com.cn发送到jyin@cynovo.com)

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. The following addresses failed:

  <yao@111.com.cn>

SMTP error from remote server after RCPT command:
host mail.111.com.cn[221.6.*.*]:
553 5.7.1 yao@111.com.cn>: Sender address rejected: not logged in

--- The header of the original message is following. ---

Received: from mail.111.com.cn (mail.111.com.cn [221.6.*.*])
    by mx.perfora.net (node=mxus1) with ESMTP (Nemesis)
    id 0Lmsp2-1Q680a2kf6-00hGon for jyin@cynovo.com; Fri, 17 Dec 2010 02:36:41 -0500
Received: from localhost (mail.111.com.cn [127.0.0.1])
    by mail.111.com.cn (iRedMail) with ESMTP id 3861C29FC9
    for <jyin@cynovo.com>; Fri, 17 Dec 2010 15:36:01 +0800 (CST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=111.com.cn; h=
    content-language:x-mailer:content-type:content-type:mime-version
    :message-id:date:date:subject:subject:to:from:from; s=dkim; t=
    1292571361; x=1293435361; bh=VmNI6SQw7o0B2kXupxhxEMPhUG/2MtxvQvZ
    Xp2Up72k=; b=m7QGmiEbvoQ4FLEjEhQsxCIyibquCthcQg+E/n3HoOGGkGJ+wHj
    m7Y4ksgaPn5kRM/dZdDbzF1aIJ5LPudo/47Df81qJUsvAjRaXDM0HT2y9i8uiSdR
    HfCmouJoQOHUWqJoxR5kf0UQ1xS529Nh+2JVW50B5tDmeyQVpbO+PVzY=
X-Virus-Scanned: Debian amavisd-new at mail.111.com.cn
Received: from mail.111.com.cn ([127.0.0.1])
    by localhost (mail.111.com.cn [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id YiV-X+sEGfuQ for <jyin@cynovo.com>;
    Fri, 17 Dec 2010 15:36:01 +0800 (CST)
Received: from ME (unknown [221.6.*.*])
    by mail.111.com.cn (iRedMail) with ESMTPSA id 1343E29E6D
    for <jyin@cynovo.com>; Fri, 17 Dec 2010 15:36:00 +0800 (CST)

我还没做过TXT及DKIM记录，是否会这个原因？邮件服务器现在对GMAIL SINA等收发正常。谢谢大家了。