aap_domain = whatever
config_directory = .
db = memcache
header_checks = ldap:hh
hh_domain = whatever
yy = aap
zz = $yy
./postconf: warning: ./main.cf: unused parameter: foo_domain=bar
./postconf: warning: ./main.cf: unused parameter: xx=proxy:ldap:foo
./postconf: warning: ./main.cf: unused parameter: aa_domain=whatever