Is postfix insisting to use nobody/nobody instead the virtual uid/gid when creating mail.. sigh.. I've checked every setting 1000 times by now and all seems correct including the entry in the db. Time to go outside before I tear all my hair out.

-rw-------    1 nobody   nobody        476 Mar 16 08:35 1047832514.V303I27c00b.cygnus
-rw-------    1 nobody   nobody        480 Mar 16 08:47 1047833231.V303I27c00c.cygnus

mysql> select * from users where address='test';
+--------------------+---------+---------------+---------+------+------+------------------+--------+-------------------+
| id                 | address | crypt         | name    | uid  | gid  | home             | domain | maildir           |
+--------------------+---------+---------------+---------+------+------+------------------+--------+-------------------+
| test@unix-girl.com | test    | nbzzN9gUKKwYw | testing | 3001 | 3000 | /data/vmbox/test |        | /data/vmbox/test/ |
+--------------------+---------+---------------+---------+------+------+------------------+--------+-------------------+
1 row in set (0.00 sec)

main.cf:
virtual_uid_maps = mysql:/etc/postfix/vuids.cf
virtual_gid_maps = mysql:/etc/postfix/vgids.cf

vuids.cf:
user = postfix
password = whatever
dbname = maildb
table = users
select_field = uid
where_field = address 

vgids.cf:
user = postfix
password = whatever
dbname = maildb
table = users 
select_field = gid
where_field = address 

Maybe it will come to me later.