Searchfilter Option

The   Auth option specifies the default search filter used to look up users for basic authentication and identity purposes when one is not specified in the   for the domain. The syntax is the same as  (see schema guide).

The default value is: (&(uid=%U)(objectclass=inetmailuser))

See also:
 * ldap_schematag MTA Option
 * canonicalsearchfilter Option
 * Auth options