Problem with postfix smtp auth

I have postfix setup on a seperate server.  The routing of the emails is fine, but when I do smtp auth it doesn't work properly.  It does work for a username that was setup a long time ago.  But no new ones..  Help..

saslauthd[15153] :main            : num_procs  : 5
saslauthd[15153] :main            : mech_option: NULL
saslauthd[15153] :main            : run_path   : /var/run/saslauthd
saslauthd[15153] :main            : auth_mech  : pam
saslauthd[15153] :ipc_init        : using accept lock file: /var/run/saslauthd/mux.accept
saslauthd[15153] :detach_tty      : master pid is: 0
saslauthd[15153] :ipc_init        : listening on socket: /var/run/saslauthd/mux
saslauthd[15153] :main            : using process model
saslauthd[15154] :get_accept_lock : acquired accept lock
saslauthd[15153] :have_baby       : forked child: 15154
saslauthd[15153] :have_baby       : forked child: 15155
saslauthd[15153] :have_baby       : forked child: 15156
saslauthd[15153] :have_baby       : forked child: 15157
saslauthd[15154] :rel_accept_lock : released accept lock
saslauthd[15155] :get_accept_lock : acquired accept lock
saslauthd[15154] :do_auth         : auth failure: [user=rtartar] [service=smtp] [realm=repowerhouse.com] [mech=pam] [reason=PAM auth error]

Thanks in advance.