最近用common-mail做邮件发送，但部分邮箱总是无法接收，一直找不到原因，请高手指点一下，谢谢！
代码：
//yahoo
// String hostName = "smtp.qq.com ";
// String from = "funcreal@qq.com ";
// String username= " ";
// String password= " ";
String to = "funcreal@yahoo.com.cn ";
email.setHostName(hostName);
email.setFrom(from);
email.setAuthentication(username,password);
email.addTo(to);
email.setSubject( "Test email with inline image ");
email.setMsg( "test msg ");
email.send();
现象：有些邮箱总是无法收到邮件。有人说是被拒绝了。但是用同样的帐户，用outlook或者foxmail就可以发过去。用代码发和用outlook发有什么不同呢？难道用代码发送，会在邮件头增加某种转发ip地址等信息？这个也说不太通。我在foxmail中查看邮件原始信息（这是个可以接收代码发送的邮件的信箱），代码发的和outlook发的是基本相同的，只是头信息中部分信息不同（于是我在代码中加入了outlook的头信息，让它看起来和outlook相同）。请看示例：
Received: from 172.16.81.117 (unknown [172.16.81.117])
by smtpbg10.qq.com (Postfix) with SMTP id 2A93B54057
for <11144556@qq.com> ; Tue, 4 Sep 2007 09:34:22 +0800 (CST)
X-QQ-mid:mx7118886966232618933
Received: from eyou.net (unknown [211.138.7.45])
by mx7.qq.com (Postfix) with SMTP id
for <11144556@qq.com> ; Tue, 4 Sep 2007 09:34:22 +0800 (CST)
X-QQ-SPAM: false
X-QQ-ASM: 000 0.00000000 000
X-EYOU-SPAMVALUE:0
X-EYOU-DEALDRC:
Received: (eyou anti_spam gateway 3.0); Tue, 04 Sep 2007 09:34:35 +0800
Message-ID: <388869675.26663@eyou.net>
X-EYOUMAIL-SMTPAUTH: 13503290132@139cn.net
Received: from 211.138.9.91 by 192.168.2.10 with SMTP; Tue, 04 Sep 2007 09:34:35 +0800
Message-ID: <4875224.1188869776478.JavaMail.fangrui_qt@211.138.7.42>
Date: Tue, 4 Sep 2007 09:04:41 +0800
From: "13503290132@139cn.net " <13503290132@139cn.net>
To: "11144556@qq.com " <11144556@qq.com>
Subject: Test email with inline image
Mime-Version: 1.0
Content-Type: text/plain; charset= "gb2312 "
Content-Transfer-Encoding: base64
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.3790.3959
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.3959
有人知道怎么回事吗？
------解决方案--------------------
开头少了个声明：SimpleEmail email = new SimpleEmail();