[horde] horde 4 integration with postfix

[OVi C]

I've seen that example. But I don't want to use custom queries. On horde 3
it use to work with the following query:

user = horde
password = *****
hosts = localhost
dbname = horde
table = horde_prefs
select_field = maildir
query = SELECT CONCAT(SUBSTR(pref_value, POSITION('@' IN pref_value)+1),
'/', pref_uid, '/') FROM horde_prefs WHERE pref_name='from_addr' and
pref_value= '%s'

but now the prefs values are BLOBS.