I have not configured anything in Jenkins config file. Please find the config.xml below.
I am using tomcat's server.xml for email configuration which I sent you earlier. Please check mail/session element in that.
<?xml version='1.0' encoding='UTF-8'?>
<hudson>
<disabledAdministrativeMonitors/>
<version>1.539</version>
<numExecutors>2</numExecutors>
<mode>NORMAL</mode>
<useSecurity>true</useSecurity>
<authorizationStrategy class="hudson.security.ProjectMatrixAuthorizationStrategy">
<permission>com.cloudbees.plugins.credentials.CredentialsProvider.Create:admin</permission>
<permission>com.cloudbees.plugins.credentials.CredentialsProvider.Delete:admin</permission>
<permission>com.cloudbees.plugins.credentials.CredentialsProvider.ManageDomains:admin</permission>
<permission>com.cloudbees.plugins.credentials.CredentialsProvider.Update:admin</permission>
<permission>com.cloudbees.plugins.credentials.CredentialsProvider.View:admin</permission>
<permission>hudson.model.Computer.Build:admin</permission>
<permission>hudson.model.Computer.Configure:admin</permission>
<permission>hudson.model.Computer.Connect:admin</permission>
<permission>hudson.model.Computer.Create:admin</permission>
<permission>hudson.model.Computer.Delete:admin</permission>
<permission>hudson.model.Computer.Disconnect:admin</permission>
<permission>hudson.model.Hudson.Administer:admin</permission>
<permission>hudson.model.Hudson.ConfigureUpdateCenter:admin</permission>
<permission>hudson.model.Hudson.Read:admin</permission>
<permission>hudson.model.Hudson.Read:munaf.kotawdekar</permission>
<permission>hudson.model.Hudson.Read:parvez.hajiani</permission>
<permission>hudson.model.Hudson.RunScripts:admin</permission>
<permission>hudson.model.Hudson.UploadPlugins:admin</permission>
<permission>hudson.model.Item.Build:admin</permission>
<permission>hudson.model.Item.Cancel:admin</permission>
<permission>hudson.model.Item.Configure:admin</permission>
<permission>hudson.model.Item.Create:admin</permission>
<permission>hudson.model.Item.Delete:admin</permission>
<permission>hudson.model.Item.Discover:admin</permission>
<permission>hudson.model.Item.Read:admin</permission>
<permission>hudson.model.Item.Workspace:admin</permission>
<permission>hudson.model.Run.Delete:admin</permission>
<permission>hudson.model.Run.Update:admin</permission>
<permission>hudson.model.View.Configure:admin</permission>
<permission>hudson.model.View.Create:admin</permission>
<permission>hudson.model.View.Delete:admin</permission>
<permission>hudson.model.View.Read:admin</permission>
<permission>hudson.scm.SCM.Tag:admin</permission>
</authorizationStrategy>
<securityRealm class="de.theit.jenkins.crowd.CrowdSecurityRealm" plugin="crowd2@1.6">
<url>
http://spg.bsil.com:8095/crowd/</url>
<applicationName>jenkins</applicationName>
<password>jenkins</password>
<group></group>
<nestedGroups>false</nestedGroups>
<useSSO>false</useSSO>
<sessionValidationInterval>2</sessionValidationInterval>
</securityRealm>
<projectNamingStrategy class="jenkins.model.ProjectNamingStrategy$DefaultProjectNamingStrategy"/>
<workspaceDir>${ITEM_ROOTDIR}/workspace</workspaceDir>
<buildsDir>${ITEM_ROOTDIR}/builds</buildsDir>
<markupFormatter class="hudson.markup.RawHtmlMarkupFormatter">
<disableSyntaxHighlighting>false</disableSyntaxHighlighting>
</markupFormatter>
<jdks/>
<viewsTabBar class="hudson.views.DefaultViewsTabBar"/>
<myViewsTabBar class="hudson.views.DefaultMyViewsTabBar"/>
<clouds/>
<slaves/>
<quietPeriod>5</quietPeriod>
<scmCheckoutRetryCount>0</scmCheckoutRetryCount>
<views>
<hudson.model.AllView>
<owner class="hudson" reference="../../.."/>
<name>All</name>
<filterExecutors>false</filterExecutors>
<filterQueue>false</filterQueue>
<properties class="hudson.model.View$PropertyList"/>
</hudson.model.AllView>
</views>
<primaryView>All</primaryView>
<slaveAgentPort>9002</slaveAgentPort>
<label></label>
<nodeProperties/>
<globalNodeProperties/>
<noUsageStatistics>true</noUsageStatistics>
</hudson>