Thid document is how to patch postfix for aragoi.

This patch file patch neccesary files and creates dict_argi.c and dict_argi.h.

Before you start , prepare user account and groups;

vipw adds to /etc/passwd:
postfix:*:12345:12345:postfix:/no/where:/no/shell

vi /etc/group add next lines

postfix:*:12345:
postdrop:*:54321:

vi  /etc/aliases  add next line
postfix: root

copy postfixargi.patch to the directory where you tar the tar file of postfix.
Make sure postfix tar file;s version number in patch file.
In the directory where you tared.
patch < postfixargi.patch
then 
go to tar created postfix directory

make tidy

make -f Makefile.init makefiles 'CCARGS=-DHAS_ARGI'

make

make install

U can check 
postconf -m to shows argi available

U have to make symbolic link of aragoi.exe in to /usr/sbin/ where postfix binary are installed
Here asum you have installed aragoi.exe in to /usr/local/aragoi/

ln -s /usr/local/aragoi/aragoi.exe .

In postfix conf file

virtual_mailbox_maps = hash:/usr/local/etc/postfix/vmaildir
change like this;
virtual_mailbox_maps = argi:/usr/local/etc/postfix/vmaildir.prg

virtual_mailbox_maps is used to find mail account's mailbox directory.

In the program vmaildir.prg which will be executed by aragoi looks like this

*********vmaildir.prg
use /usr/local/postfix/etc/vmaildir.dbf inde vmail.ndx
&&need specify the location of dbf and index files
&&vmail.ndx is indexed on key field
value = getarg(2)

if seek(value)
output(mailbox)	&&if found, return result value
else
output("") 	&&if not found, return blank !
endif
use
************************************
vmail.dbf
mailacnt char 50 
mailbox	char 80

vmail.ndx is indexed on mailacnt
 
How to check

postmap -q serachstring argi:/directory/abc.prg
if success
it return target string
if failes
return nothing