JSP 代码调用 linux sendmail 报错。150分酬谢！

搞了几天了
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关于JSP 代码调用 linux sendmail 的问题。
收件地址为服务器的帐户程序执行正常，可以收发。如 ： root@testmail.com
但是收件地址为其他邮箱就报错如下：


500 Servlet Exception
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class javax.mail.SendFailedException: 550 5.7.1 <aaa@bbb.com>... Relaying denied. IP name lookup failed [10.181.3.14]

at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:926)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:389)
at _jsp._trw._testmail__jsp._jspService(/trw/testmail.jsp:34)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.pageservice(Page.java:571)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:155)
at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:177)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:177)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:221)
at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:392)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:323)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:430)
at com.caucho.util.ThreadPool.run(ThreadPool.java:377)
at java.lang.Thread.run(Thread.java:534)

请大家帮忙。解决问题后150分酬谢！