我刚配置的imail每次发送都提示成功，但是只有部分邮箱能收到比如xxx@165sc.com,新浪、163、tom的邮箱却收不到，返回的是系统退信，是什么原因？
退信内容如下：
Delivery failed 20 attempts: zydia7903@163.com

SMTP connection faile


Original message follows.

Received: from 61.243.2.41 with HTTP
by webserver mail.xczcwl.com (218.88.252.40) ; Wed, 18 Apr 2007 16:15:07 +0800
Date: Wed, 18 Apr 2007 16:15:07 +0800
Message-Id: <200704181615.AA327788@mail.xczcwl.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
From: "xczcwl" <xczcwl@mail.xczcwl.com>
Reply-To: <xczcwl@mail.xczcwl.com>
To: <zydia7903@163.com>
Subject: xczcwl
X-Mailer: <IMail v8.22>

xczcwl

检查看看是不是防毒或者dns设置有问题

设置检查无误后看日志查问题。