javamail 使用ssl发送邮件问题。：报错

大神们，我使用javamail ssl发送邮件，为什么我的还是会报异常呢？

Exception in thread "main" javax.mail.MessagingException: Could not connect to SMTP host: smtp.gdyilian.com, port: 465; nested exception is: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1963) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654) at javax.mail.Service.connect(Service.java:367) at javax.mail.Service.connect(Service.java:226) at javax.mail.Service.connect(Service.java:175) at javax.mail.Transport.send0(Transport.java:253) at javax.mail.Transport.send(Transport.java:124) at test.GmailSender.main(GmailSender.java:55) Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:150) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1476) at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:174) at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:168) at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:847) at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:106) at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:495) at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:433) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:815) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1025) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1038) at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:528) at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:333) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:208) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927) ... 7 more Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:221) at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:145) at sun.security.validator.Validator.validate(Validator.java:203) at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:172) at com.sun.net.ssl.internal.ssl.JsseX509TrustManager.checkServerTrusted(SSLContextImpl.java:320) at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:840) ... 17 more Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:236) at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:194) at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:216) ... 22 more

我的实现。

public static void main(String[] args) throws AddressException,
			MessagingException {
		Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
		final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
		// Get a Properties object
		Properties props = System.getProperties();
		props.setProperty("mail.smtp.host", "smtp.gdyilian.com");
		props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);
		props.setProperty("mail.smtp.socketFactory.fallback", "false");
		props.setProperty("mail.smtp.port", "465");
		props.setProperty("mail.smtp.socketFactory.port", "465");
		props.put("mail.smtp.auth", "true");
		final String username = "payreporter@payeco.com";
		final String password = "4489a6";
		Session session = Session.getDefaultInstance(props,
				new Authenticator() {
					protected PasswordAuthentication getPasswordAuthentication() {
						return new PasswordAuthentication(username, password);
					}
				});

		Message msg = new MimeMessage(session);

		msg.setFrom(new InternetAddress(username));
		msg.setRecipients(Message.RecipientType.TO,
				InternetAddress.parse("yangbo343567562@sina.cn", false));
		msg.setSubject("Hello");
		msg.setText("How are you");
		msg.setSentDate(new Date());
		Transport.send(msg);

		System.out.println("Message sent.");
	}

求各位大神帮忙解决一下。实在是不知道怎么回事了。

使用的是公司的邮箱发往新浪的邮箱异常！而使用foxmail客户端可以发送到新浪等邮箱去。

公司的邮箱只能给本公司的发送。使用新浪的邮箱发送，可以发送到任意又想去。

求各位大哥大姐给小弟看看是java代码里面的配置哪里不到位？