javaMail发送邮件错误：Could not connect to SMTP host: pop.sina.com

[zsq_kaka1]

用163、qq、sina邮箱都出现相同错误：

DEBUG: setDebug: JavaMail version 1.4.3
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "pop.sina.com", port 25, isSSL false
发送邮件产生的错误：Could not connect to SMTP host: pop.sina.com, port: 25

发送邮件的方法（部分代码）：

public int sendMail(SendMailForm s) {
		int ret = 0;
		String host = s.getHost();				//POP3服务器
		String from = s.getAddresser();			//发件人
		String to = s.getAddressee();							//收件人
		String subject = s.getTitle();							//主题
		String content = s.getContent();			//邮件内容
		String password = s.getPwd();			//发件人密码
		String path = s.getAdjunct();							//附件1
		String path1=s.getAdjunct1();			//附件2
		try {
			//String mailserver ="smtp."+to.substring(to.indexOf('@')+1,to.length());	
                 //在Internet上发送邮件时的代码
			String mailserver =host;									//在局域网内发送邮件时的代码

			Properties prop = new Properties();		//实例化Properties类
			prop.put("mail.smtp.host", mailserver);	
                  //指定采用SMTP协议的邮件发送服务器的主机名
			prop.put("mail.smtp.auth", "true");			//指定SMTP服务器需要验证
			Session sess = Session.getDefaultInstance(prop);	
                  //根据已经配置的属性创建Session实例
			sess.setDebug(true);		//设置调试标志
			MimeMessage message = new MimeMessage(sess);	//实例化MimeMessage类
			message.setFrom(new InternetAddress(from));	// 给消息对象设置发件人
			//设置收件人
			String toArr[]=to.split(",");		
                //将以逗号分隔的收件人字符串转换为数组
			InternetAddress[] to_mail=new InternetAddress[toArr.length];	
			for(int i=0;i<toArr.length;i++){
				to_mail[i]=new InternetAddress(toArr[i]);	
                //将收件人地址转换为InternetAddress类的对象
			}
		    message.setRecipients(Message.RecipientType.TO,to_mail);	//设置收件人
			message.setSubject(subject);	//设置主题
			java.util.Date sendTime=new java.util.Date();
			...		
	}

对邮箱都进行了SMTP/POP3设置，但依然出现这个问题，求助...各位网友

[huntor]

DEBUG SMTP: trying to connect to host "pop.sina.com", port 25, isSSL false

怎么前面是SMTP，后面连接 pop