一个奇怪的java mail问题

代码如下：


String body="<div><img src=\"http://www.jguru.com/images/logo.gif\" 测试内容</div>";
Properties props = new Properties();
props.put("mail.smtp.host", server);
props.put("mail.smtp.port", String.valueOf(port));
props.put("mail.smtp.auth", "true");
Transport transport = null;
Session session = Session.getDefaultInstance(props, null);
transport = session.getTransport("smtp");
transport.connect(server, user, password);
MimeMessage msg = new MimeMessage(session);
msg.setSentDate(new Date());
InternetAddress fromAddress = new InternetAddress(user, from,
"UTF-8");
msg.setFrom(fromAddress);
InternetAddress[] toAddress = new InternetAddress[1];
toAddress[0] = new InternetAddress("123MM@126.com");
msg.setRecipients(Message.RecipientType.TO, toAddress);
msg.setSubject(subject, "UTF-8");

Multipart mainPart=new MimeMultipart();
//创建一个包含Html内容的MimeBodyPart
MimeBodyPart htmlText=new MimeBodyPart();
//设置HTML内容
htmlText.setContent(body,"text/html;charset=utf-8"); //"text/html;charset=utf-8"
mainPart.addBodyPart(htmlText);

msg.setContent(mainPart);

transport.sendMessage(msg, msg.getAllRecipients());

邮件发送成功。
但是126邮箱收不到邮件。
分析发现body字符串只要不含有“http” 就能收到，请问为什么，急需解决，谢谢。