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สำหรับการ config ตัว Pen ที่ใช้งานเป็น Load balance ให้พวก protocol ต่างๆ เช่น http , smtp , pop ,
imap เราต้องเปิด option "ipfilter" ใน kernel ไว้ด้วยน่ะครับ

1.cd /usr/src/sys/i386/conf
2.cp GENERIC PENBSD

options IPFILTER
options IPFILTER_LOG

หลังจากเสร็จแล้ว

1.config PENBSD
2.cd /usr/src
3.make kernel KERNCONF=PENBSD
4.make installkernel KERNCONF=PENBSD

ตัว vda ลงไปเพื่อ แก้รักษาโรค อะไรอ่านได้ครับ อิอิ

เป็นไทย : เวลาต้องการให้ user มี quota mailbox ของแต่ละ user ต้องลง vda patch เข้าไปช่วยกันครับผม
สำหรับการ patch ต้องเชค version ของ postfix ด้วยนะครับ
หลังจาก check version postfix เสร็จ ต้องทำการ check version ของ database ด้วยว่าใช้ตัวไหน เช่นใช้ openldap

ต้องลง vda ดังนี้
postfix-ldap_2.5.5-1.1-vda0_amd64.deb
postfix_2.5.5-1.1-vda0_amd64.deb


* Mailbox / Maildir size limit, known also as "soft quota", to avoid user take
all you disk space
* Customizable "limit" message when the soft quota limit is reached. NOTE: message
is sent to senders, but NOT to the owner of the mailbox.
* Limit only 'INBOX', because some people use IMAP and don't want the same limit in
IMAP folder that are differents from INBOX.
* Support for 'Courier' style Maildir, usefull for people that use courier as pop3/imap
server and to get fast soft quota summary. Note that it is also compatible with qmail maildir per
default.
* Supports for Courier 'maildirsize' file in Maildir folder that is used to read quotas
quickly. Note that this option is not actived per default and can be dangerous on some NFS client
implementation (like for example Solaris that cache some filesystem operations).
* Customisable suffix for Maildir support, when share same external dict between postfix and
pop3/imap server sometime "Maildir/" suffix is needed to avoid extra database handling
(eg LDAP, MySQL...).

download version ที่ใช้ได้ที่

http://vda.sourceforge.net/VDA/

apt-get build-dep postfix

cd /usr/src
apt-get source postfix

(Make sure you use the correct Postfix version in the following commands. I have Postfix 2.5.5
installed. You can find out your Postfix version by running

postconf -d | grep mail_version

The output should look like this:

server1:/usr/src# postconf -d | grep mail_version
mail_version = 2.5.5
milter_macro_v = $mail_name $mail_version
server1:/usr/src#

)

wget http://vda.sourceforge.net/VDA/postfix-2.5.5-vda-ng.patch.gz
gunzip postfix-2.5.5-vda-ng.patch.gz
cd postfix-2.5.5
patch -p1 < ../postfix-2.5.5-vda-ng.patch
dpkg-buildpackage

dpkg -i postfix_2.5.5-1.1_i386.deb postfix-mysql_2.5.5-1.1_i386.deb

ต้องดูให้ตรง กับ รุ่น os ที่ใช้ด้วยน่ะครับ ว่าเป็น 32 bit or 64 bit

pop00:/home/golf/___script___# telnet localhost 110
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
+OK Hello there.
user golfs@example.com
+OK Password required.
pass PASSGU
+OK logged in.
LIST
+OK POP3 clients that break here, they violate STD53.
1 1326
2 467
.
RETR 1
+OK 1326 octets follow.
Return-Path: < postmaster@example.com>;
Delivered-To: golfs@example.com
Received: from ldap00.xx.com (ldap00.th.xx.com [10.17.200.22])
by pop00.xx.com (Postfix) with ESMTP id D4B374C8069
for < golfs@example.com>;; Tue, 10 Nov 2009 17:57:00 +0700 (ICT)
Received: from ldap00.xx.com (localhost [127.0.0.1])
by ldap00.xx.com (Postfix) with ESMTP id F14376DF824
for < golfs@example.com>;; Tue, 10 Nov 2009 17:57:00 +0700 (ICT)
Received: (from www@localhost)
by ldap00.xx.com (8.14.3/8.14.3/Submit) id nAAAv0NL085397;
Tue, 10 Nov 2009 17:57:00 +0700 (ICT)
(envelope-from postmaster@example.com)
Date: Tue, 10 Nov 2009 17:57:00 +0700 (ICT)
X-Authentication-Warning: ldap00.xx.com: www set sender to postmaster@example.com using -f
To: golfs@example.com
Subject: Welcome to xx mail service
Message-ID: < 1257850620883_36a8e9eb903b074f4fa6ca13c8395ab9@116.68.150.233>;
X-Mailer: Phamm
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: < postmaster@xx.com>;


Welcome to ddd service!
-----------------------------------------------

Dear users,

Thank you for using ddd service.

Please kindly consider change your password periodically for your security.



.
quit
+OK Bye-bye.

###setting dns load balance by round robin

Balancing Mail

The normal method of handling mail fail-over is using the 'preference' value which is
described in this note. However, using the MX record you can balance mail in two ways.

1. Define multiple MX records with the same priority e.g.

; zone file fragment
IN MX 10 mail.example.com.
IN MX 10 mail1.example.com.
IN MX 10 mail2.example.com.
....
mail IN A 192.168.0.4
mail1 IN A 192.168.0.5
mail2 IN A 192.168.0.6

The name server will deliver the MX records in the order defined by the rrset-order and the
receiving SMTP software will select one based on its algorithm. In some cases the SMTP alogithm may
work against the definition of the rrset-order statement. Current versions of sendmail (8.13.x),
Exim (4.44) and Postfix (2.1 or 2.2) all have definitive references to indicate they randomly select
equal preference servers (Postfix allows control of the behaviour with the smtp_randomize_addresses
parameter) and consequentially may use an address which the rrset-order has carefully tried to
change! qmail, courier-mta and Microsoft (Exchange and IIS SMTP) documentation does not appear to
have definitive references to indicate how they handle this case.
2. The alternate approach is to define multiple A records with the same name and multiple IP
addresses.

; zone file fragment
IN MX 10 mail.example.com.
....
mail IN A 192.168.0.4
IN A 192.168.0.5
IN A 192.168.0.6

In this case the load-balancing effect is under the control of BIND and the rrset-order
record. In order to avoid problems if the receiving mail system does reverse look-up as a spam check
then the PTR records for 192.168.0.4, 192.168.0.5, 192.168.0.6 above must all define to
mail.example.com.

In all the above cases each mail server must be capable of handling and synchronising the load for
all the mail boxes served by the domain, using some appropriate back-end to do this or by defining
all but one server to be a relay or forwarder.

Balancing Other Services

Assuming you want to load share your ftp or web services then you simply define multiple A records
with the same name and different IPs as in the example below.

; zone file fragment

ftp IN A 192.168.0.4
ftp IN A 192.168.0.5
ftp IN A 192.168.0.6
www IN A 192.168.0.7
www IN A 192.168.0.8

; or use this format which gives exactly the same result
ftp IN A 192.168.0.4
IN A 192.168.0.5
IN A 192.168.0.6
www IN A 192.168.0.7
IN A 192.168.0.8

The DNS will deliver all the IP addresses defined, the first IP address in the list will be in a
default round robin (controlled by the rrset-order 'named.conf' statement). The FTP and WEB
servers must all be exact replicas of each other in this scenario.

ถ้าต้องการให้ account ใน example.com ส่งเข้าได้เฉพาะ domain

example.com
hotmail.com

ก็เพิ่มในไฟล์ local_domains เป็น
example.com OK
hotmail.com OK

postmap /etc/postfix/local_domains
/etc/init.d/postfix restart

### อ่านเพิ่มเติมได้ที่

http://www.postfix.org/RESTRICTION_CLASS_README.html#external

###System admin should know
    http://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html
    http://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html
    http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html
    http://www.cyberciti.biz/tips/download-email-client-for-linux-mac-osx-windows.html
    http://www.cyberciti.biz/faq/top5-linux-video-editing-system-software/