This is a short tutorial to install Postfix, Courier-authlib and  Courier-imap in Opensuse 11.1 x86_64 O/s
This tutorial also working for other x86_64 o/s or 64 bit O/s

Edit ld.so.conf and add 1 lines below

#vi /etc/ld.so.conf

## add few lines below in the end of file ##
/usr/local/mysql/lib/mysql
/usr/local/mysql/include
/usr/local/ssl/include/openssl
/usr/include
/usr/include/openssl

Reload with ldconfig

#ldconfig

We will start to map virtual domain to support IMAP.
So we just discuss about how to map virtual domain to support imap here.
if you search something like install postfix or convert postfix mailbox.
please kindly to take a look this url below :

How To Install Postfix, Cyrus-SASL and VM-pop3d
How To Convert Postfix mbox to maildir

FYI : in this tutorial i still using same configuration from How To install Postfix, Cyrus-SASL and VM-pop3d.

In this tutorial i just want to configure postfix to listen to port 25 and port 26 TCP.

So in this case i assume you already have postfix installed on the server and running smoothly.
If you want to install a simple postfix mailserver without mysql DB,
please kindly to look these following URL below :
How to Configure Postfix, Cyrus-SASL and VM-Pop3d

In This tutorial i will write a steps how to configure postfix to working with dspam and clamav.
So if you search my site for Postfix Cyrus SASL, Mysql, Postfixadmin, Courier Authlib and Courier Imap you can click here

So What is Dspam ?

This is just a few of postfix installation from source issue from my end.
Hope this also can help ppl how to fixed your postfix installation .

I will add more Q/A when i found any other issue then.

What is Postfix, Cyrus-SASL and Vm-pop3d ?

Postfix is a free and open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA.

What is SPF, ClamAV, Amavisd-new and Spamassassin?

The Sender Policy Framework (SPF) is an open standard specifying a technical method to prevent sender address forgery. More precisely, the current version of SPF — called SPFv1 or SPF Classic — protects the envelope sender address, which is used for the delivery of messages.

What is Postfix, Postfixadmin, Cyrus-SASL, Courier Authlib, Courier-Imap, Squirellmail ?

Postfix is a free open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA.

Postfix Admin is a web based interface to configure and manage a Postfix based email server for many users.

What is Postfix, Postfixadmin, Cyrus-SASL, Courier Authlib, Courier-Imap, Squirellmail ?

Postfix is a free open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA.

Postfix Admin is a web based interface to configure and manage a Postfix based email server for many users.

What is Backup Mailserver / Secondary Mailserver ?

When your mail server is not accessible by others you have a chance of losing valuable emails. These lost emails can result in lost sales and loss revenue. You can prevent this today by using Backup Mail Service/ Secondary Mailserver.