javax.mail.MessagingException: 553 authentication is required

javax.mail.MessagingException: 553 authentication is required,smtp1,ClUQrEBZRUJX0rRPvSYiAg--.48266S2 1337250391

    at com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:1020)
    at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:716)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:388)
    at com.oarage.easystation.sendmail.MailSendClass.send(MailSendClass.java:143)
    at com.oarage.easystation.sendmail.MailSendClass.main(MailSendClass.java:153)

找了好久，最后发现了错误的原因。

我写成了这样的，props.put("mail.smtp.auth", true);//设置smtp身份认证
实际应该是这props.put("mail.smtp.auth", “true”);//设置smtp身份认证,而且"mail.smtp.auth"不要有空格(切记)