org.apache.commons.mail.EmailException: Sending the email to the following server failed : XXX.XX.XXX.XX:25

DNS dns related problem

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org.apache.commons.mail.EmailException: Sending the email to the following server failed : XXX.XX.XXX.XX:25
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)
        at org.apache.commons.mail.Email.send(Email.java:1267)
        at kr.go.elevator.com.mail.service.ComMail.htmlEmailSend(ComMail.java:67)
        at kr.go.elevator.com.mail.service.ComMail.htmlEmailSend(ComMail.java:29)
        at kr.go.elevator.com.user.web.ComUserInfoController.updateUser(ComUserInfoController.java:228)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
        at java.lang.reflect.Method.invoke(Method.java:611)
        at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:421)
        at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:136)
        at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:326)
        at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:313)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:818)
        at jeus.servlet.engine.ServletWrapper.executeServlet(ServletWrapper.java:329)
        at jeus.servlet.filter.FilterChainImpl.internalDoFilter(FilterChainImpl.java:138)
        at jeus.servlet.filter.FilterChainImpl.doFilter(FilterChainImpl.java:90)
        at kr.go.elevator.com.weblog.web.filter.ComWebLogFilter.doFilter(ComWebLogFilter.java:82)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
        at jeus.servlet.filter.FilterChainImpl.internalDoFilter(FilterChainImpl.java:121)
        at jeus.servlet.filter.FilterChainImpl.doFilter(FilterChainImpl.java:90)
        at kr.go.elevator.com.security.web.filter.ComSecurityFilter.doFilter(ComSecurityFilter.java:65)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
        at jeus.servlet.filter.FilterChainImpl.internalDoFilter(FilterChainImpl.java:121)
        at jeus.servlet.filter.FilterChainImpl.doFilter(FilterChainImpl.java:90)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
        at jeus.servlet.filter.FilterChainImpl.internalDoFilter(FilterChainImpl.java:121)
        at jeus.servlet.filter.FilterChainImpl.doFilter(FilterChainImpl.java:90)
        at kr.go.elevator.com.cmm.HttpsCookieFilter.doFilter(HttpsCookieFilter.java:45)
        at jeus.servlet.filter.FilterChainImpl.internalDoFilter(FilterChainImpl.java:121)
        at jeus.servlet.filter.FilterChainImpl.doFilter(FilterChainImpl.java:90)
        at jeus.servlet.engine.ServletWrapper.execute(ServletWrapper.java:205)
        at jeus.servlet.engine.WebtobRequestProcessor.run(WebtobRequestProcessor.java:253)
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 451 4.1.8 Domain of sender address webmaster@XXXXX.co.kr does not resolve

        at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
        at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
        at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)
        at javax.mail.Transport.send0(Transport.java:169)
        at javax.mail.Transport.send(Transport.java:98)
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)
        ... 40 more