Unable to send email when the SMTP server requires authentication

javax.mail.MessagingException: Failed to send mail message [org.xwiki.mail.internal.ExtendedMimeMessage@18a68bd];
  nested exception is:
 com.sun.mail.smtp.SMTPSendFailedException: 530-5.5.1 Authentication Required. Learn more at
530 5.5.1 http://support.google.com/mail/bin/answer.py?answer=14257 td9sm15399035wic.15 - gsmtp

 at org.xwiki.mail.internal.DefaultMailSender.send(DefaultMailSender.java:84)
 at org.xwiki.mail.script.MimeMessageWrapper.send(MimeMessageWrapper.java:139)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
 at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
 at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
 at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:238)
 at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:193)
 at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:124)
 at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:50)
 at org.xwiki.rendering.macro.script.AbstractScriptMacro.evaluateBlock(AbstractScriptMacro.java:286)
 at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:182)
 at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:58)
 at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:251)
 at org.xwiki.rendering.internal.transformation.DefaultRenderingContext.transformInContext(DefaultRenderingContext.java:183)
 at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:94)
 at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:252)
 at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:125)
 at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:55)
 at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:96)
 at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:39)
 at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:113)
 at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50)
 at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)
 at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)
 at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:1100)
 at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:1078)
 at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:1110)
 at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:618)
 at sun.reflect.GeneratedMethodAccessor190.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
 at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
 at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
 at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:238)
 at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:193)
 at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:131)
 at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1686)
 at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1602)
 at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1570)
 at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:801)
 at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
 at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
 at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
 at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:238)
 at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:193)
 at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:131)
 at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1686)
 at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1602)
 at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:179)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:358)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:149)
 at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
 at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
 at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
 at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
 at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:115)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
 at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:126)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
 at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
 at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
 at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
 at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
 at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
 at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
 at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
 at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
 at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
 at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
 at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
 at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
 at org.eclipse.jetty.server.Server.handle(Server.java:370)
 at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
 at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
 at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
 at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
 at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
 at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
 at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
 at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
 at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
 at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
 at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 530-5.5.1 Authentication Required. Learn more at
530 5.5.1 http://support.google.com/mail/bin/answer.py?answer=14257 td9sm15399035wic.15 - gsmtp

 at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2114)
 at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1618)
 at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1119)
 at org.xwiki.mail.internal.DefaultMailSenderThread.sendMail(DefaultMailSenderThread.java:145)
 at org.xwiki.mail.internal.DefaultMailSenderThread.run(DefaultMailSenderThread.java:91)