LDAP + saslauthd problems

[AJ]

Hi,
   I am using saslauthd 2.1.19 w/ RHEL4 and I am trying to  
authenticate to an ldap server via the user's mail attribute and  
userPassword.  I am using the -r flag w/ saslauthd and here is my  
saslauthd.conf file:

ldap_servers: ldap://148.4.5.111
ldap_search_base: ou=Users,dc=domain,dc=com
ldap_filter: (&(mail=%U@%d))
ldap_use_sasl: yes

Trying to test w/ testsaslauthd via:

testsaslauthd -u john at domain.com -p test

does not work.

Am I using the correct ldap_filter and saslauthd syntax?

Thanks.
AJ