When I configure the email-ext plugin of Hudson and try to send a email to the administrator of the Hudson it gives an error like this. I don't have any Idea to work with this. Try enabling the SSL option. Then it gives another error. Can anyone please help me. I'm new to this area. So need a helping hand for it.

Failed to send out e-mail

com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first

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 hudson.tasks.Mailer$DescriptorImpl.doSendTestMail(Mailer.java:464)

at sun.reflect.GeneratedMethodAccessor320.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:235)

at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:116)

at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:57)

at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:75)

at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)

at org.kohsuke.stapler.Stapler.invoke(Stapler.java:525)

at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:319)

at org.kohsuke.stapler.Stapler.invoke(Stapler.java:525)

at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:145)

at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)

at org.kohsuke.stapler.Stapler.invoke(Stapler.java:525)

at org.kohsuke.stapler.Stapler.invoke(Stapler.java:441)

at org.kohsuke.stapler.Stapler.service(Stapler.java:123)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)

at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)

at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)

at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)

at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)

at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)

at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)

at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)

at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)

at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)

at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)

at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)

at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)

at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)

at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)

at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)

at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)

at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)

at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244)

at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)

at java.lang.Thread.run(Unknown Source)

Thank you...