Ini berikut saya sertakan listing file yang berada di /var/qmail/control, dan
isinya
-*--------------
[irwanhadi@localhost control]$ ls -ls
total 8
   1 -rw-r--r--    1 root     root            4 Dec 21 14:12 badmailfrom
   1 -rw-r--r--    1 root     root           10 Jan  5 17:25 defaultdomain
   1 -rw-r--r--    1 root     root           32 Jan  5 17:52 locals
   1 -rw-r--r--    1 root     root           10 Jan  5 17:25 me
   1 -rw-r--r--    1 root     root           10 Jan  5 17:25 plusdomain
   1 -rw-r--r--    1 root     root           45 Jan  5 17:52 rcpthosts
   1 -rw-r--r--    1 root     root           21 Jan  2 02:38 smtpgreeting
   1 -rw-r--r--    1 root     root           24 Jan  5 17:52 virtualdomains 
---------------------
Isinya
[irwanhadi@localhost control]$ cat defaultdomain
localhost
[irwanhadi@localhost control]$ cat locals
127.0.0.1
 
 
localhost
localhost
[irwanhadi@localhost control]$ cat me
localhost
[irwanhadi@localhost control]$ cat plusdomain
localhost
[irwanhadi@localhost control]$ cat rcpthosts
localhost
 
 
 
localhost
localhost
testing.com
[irwanhadi@localhost control]$ cat smtpgreeting
Welcome to localhost
[irwanhadi@localhost control]$ cat virtualdomains
testing.com:testing.com
[irwanhadi@localhost control]$       
-----------------------------
Kalau dicoba mengirim surat ke domain di luar localhost selalu keluarnya
[irwanhadi@localhost control]$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 Welcome to localhost ESMTP
helo testing
250 Welcome to localhost
mail from: [EMAIL PROTECTED]
250 ok
rcpt to: [EMAIL PROTECTED]
553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
data
503 RCPT first (#5.5.1)
quit                          
-------------
Nah yang jadi pertanyaan, bagaimana caranya bisa set itu qmail agar bisa
berfungsi sebagai MTA, dalam artian dia dipasang di localhost, terus dia harus
mau dong mendelivery ke tujuan sekalipun tujuan diluar localhost jika IP si
pengirim adalah localhost juga, dan mereject untuk mengirim surat kecuali
localhost jika IP si pengirim di luar localhost.

Tambahan, di etc/hosts.deny dan etc/hosts.allow
[irwanhadi@localhost /etc]$ cat hosts.allow
#
# hosts.allow   This file describes the names of the hosts which are
#               allowed to use the local INET services, as decided
#               by the '/usr/sbin/tcpd' server.
#
ALL: LOCAL                        
[irwanhadi@localhost /etc]$ cat hosts.deny
#
# hosts.deny    This file describes the names of the hosts which are
#               *not* allowed to use the local INET services, as decided
#               by the '/usr/sbin/tcpd' server.
#
# The portmap line is redundant, but it is left to remind you that
# the new secure portmap uses hosts.deny and hosts.allow.  In particular
# you should know that NFS uses portmap!
ALL: ALL
[irwanhadi@localhost /etc]$   

Add ons qmail yang terpasang a.l
serial mail, qmail analog, qmailadmin, vpopmail, rblsmtpd, ucspi, fastforward

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