Email doesn't authenticate against PHP... So I'm going to presume you mean that your trying to use osTicket to use SMTP Auth to your mail server and its failing. Are you getting any errors that you can share with us so that we can point you in the right direction?The Email settings are documented here: http://osticket.com/wiki/Email_settingsThe LDAP guide I wrote a while ago is here: http://forum.osticket.com/d/discussion//how-to-configure-the-ldap-authentication-and-lookup-plugin