[xwiki-users] Xwiki registration smtp setup

Hi, For smtp setup for xwiki registration (Administration<http://www.people-to-remember.com/xwiki/bin/view/XWiki/>> Preferences <http://www.people-to-remember.com/xwiki/bin/view/XWiki/XWikiPreferences> > Registration ), I see a value for SMTP server, though how do I configure the authentication settings to be able to login into the smtp server, such as userid / password? Thanks in advance, Josh