发送邮件出现异常,请高手指点

使用java mail写邮件发送程序,已经加入认证,系统提示:
DEBUG SMTP RCVD: 235 OK Authenticated


DEBUG SMTP: use8bit false

DEBUG SMTP SENT: MAIL FROM:<samzw@km169.net>

javax.mail.MessagingException: 553 From <samzw@km169.net>, message blocked.
at com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:879)

at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:599)

at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:319)

at cn.com.opendata.mail.processAssign.sendMessage(processAssign.java:317)DEBUG SMTP RCVD: 553 From <samzw@km169.net>, message blocked.




at cn.com.opendata.mail.processAssign.run(processAssign.java:73)