<system.net>
  <mailSettings>
    <smtp from="xx@gmail.com">
      <network host="smtp.gmail.com" port="587" password="password" userName="xx@gmail.com" enableSsl="true" defaultCredentials="false" />
    </smtp>
  </mailSettings>
</system.net>

aspnet_regiis -pc "MailSendKeys" –exp

aspnet_regiis -px "MailSendKeys" "C:MailSendKeysFile.xml" -pri