出现这样的错误：
javax.mail.SendFailedException: Invalid Addresses; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 Recipient Rejected: Relay not allowed
还有一种：javax.mail.SendFailedException: Invalid Addresses; nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 500 error
我javamail的什么包都有拉，怎么回事呢 ？？？？
參考答案:发送错误，无效IP发不过去 检查网络设置
