[xwiki-users] Send email is not working?

I did set mail setting for sending the mails as per http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Configuration. Then i icreated the page with mailTestingUtility given at http://extensions.xwiki.org/xwiki/bin/view/Extension/Test+Mail. But i get below error message A problem occurred while sending the mail. 2013-06-19 16:30:21,730 ERROR [ http://ing-wikvp001:8080/testEmail/bin/view/testWiki/test1] c.x.x.p.m.MailSenderPluginApi [MailSenderPluginApi.java:173] Failed to send email [From [no-reply(a)xwiki.com], To [scottmiles(a)Fiserv.com], Subject [TestMail], Text [Please get it]] javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587 at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282) ~[mail-1.4.jar:1.4] at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370) ~[mail-1.4.jar:1.4] at javax.mail.Service.connect(Service.java:275) ~[mail-1.4.jar:1.4] at javax.mail.Service.connect(Service.java:156) ~[mail-1.4.jar:1.4] at javax.mail.Service.connect(Service.java:176) ~[mail-1.4.jar:1.4] at com.xpn.xwiki.plugin.mailsender.MailSenderPlugin.sendMails(MailSenderPlugin.java:712) ~[xwiki-platform-mailsender-3.5.jar:na] at com.xpn.xwiki.plugin.mailsender.MailSenderPlugin.sendMail(MailSenderPlugin.java:664) ~[xwiki-platform-mailsender-3.5.jar:na] at com.xpn.xwiki.plugin.mailsender.MailSenderPlugin.sendMail(MailSenderPlugin.java:650) ~[xwiki-platform-mailsender-3.5.jar:na] details i used for gmail server are:- SMTP SERVER = smtp.gmail.com PORT = 587 SMTP SERVER USERNAME (OPTIONAL) mine gmail address password:- mine password ADDITIONAL JAVAMAIL PROPERTIES= mail.smtp.starttls.enable=true i am on xwiki 3.5