There is a new version of this tutorial available for Fedora 18.

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Fedora 15 x86_64)

Version 1.0
Author: Falko Timme
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This tutorial is Copyright (c) 2011 by Falko Timme. It is derived from a tutorial from Christoph Haas which you can find at You are free to use this tutorial under the Creative Commons license 2.5 or any later version.

This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses.

The resulting Postfix server is capable of SMTP-AUTH and TLS and quota (quota is not built into Postfix by default, I'll show how to patch your Postfix appropriately). Passwords are stored in encrypted form in the database (most documents I found were dealing with plain text passwords which is a security risk). In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

The advantage of such a "virtual" setup (virtual users and domains in a MySQL database) is that it is far more performant than a setup that is based on "real" system users. With this virtual setup your mail server can handle thousands of domains and users. Besides, it is easier to administrate because you only have to deal with the MySQL database when you add new users/domains or edit existing ones. No more postmap commands to create db files, no more reloading of Postfix, etc. For the administration of the MySQL database you can use web based tools like phpMyAdmin which will also be installed in this howto. The third advantage is that users have an email address as user name (instead of a user name + an email address) which is easier to understand and keep in mind.

This howto is meant as a practical guide; it does not cover the theoretical backgrounds. They are treated in a lot of other documents in the web.

This document comes without warranty of any kind! I want to say that this is not the only way of setting up such a system. There are many ways of achieving this goal but this is the way I take. I do not issue any guarantee that this will work for you!


1 Preliminary Note

This tutorial is based on Fedora 15 x86_64, so you should set up a basic Fedora 15 server installation before you continue with this tutorial (e.g. as shown in the first seven chapters of The Perfect Server - Fedora 15 x86_64 [ISPConfig 3]). The system should have a static IP address. I use as my IP address in this tutorial and as the hostname.

You should make sure that the firewall is off (at least for now) and that SELinux is disabled (this is important!).


2 Install Some Software

First we update our existing packages on the system:

yum update

Now we install some software that we need later on:

yum groupinstall 'Development Tools'
yum groupinstall 'Development Libraries'


3 Install Apache, MySQL, phpMyAdmin

This can all be installed with one single command (including the packages we need to build Courier-IMAP):

yum install ntp httpd mysql-server php php-mysql php-mbstring rpm-build gcc mysql-devel openssl-devel cyrus-sasl-devel pkgconfig zlib-devel phpMyAdmin pcre-devel openldap-devel postgresql-devel expect libtool-ltdl-devel openldap-servers libtool gdbm-devel pam-devel gamin-devel libidn-devel


4 Install Courier-IMAP, Courier-Authlib, And Maildrop

Unfortunately there are no rpm packages for Courier-IMAP, Courier-Authlib, and Maildrop, therefore we have to build them ourselves.

RPM packages should not be built as root; courier-imap will even refuse to compile if it detects that the compilation is run as the root user. Therefore we create a normal user account now (falko in this example) and give him a password:

useradd -m -s /bin/bash falko
passwd falko

We will need the sudo command later on so that the user falko can compile and install the rpm packages. But first, we must allow falko to run all commands using sudo:



In the file that opens there's a line root ALL=(ALL) ALL. Add a similar line for falko just below that line:

## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
falko   ALL=(ALL)       ALL

Now we are ready to build our rpm package. First become the user falko:

su falko

Next we create our build environment:

mkdir $HOME/rpm
mkdir $HOME/rpm/SOURCES
mkdir $HOME/rpm/SPECS
mkdir $HOME/rpm/BUILD
mkdir $HOME/rpm/SRPMS
mkdir $HOME/rpm/RPMS
mkdir $HOME/rpm/RPMS/i386
mkdir $HOME/rpm/RPMS/x86_64
echo "%_topdir $HOME/rpm" >> $HOME/.rpmmacros

Now we create a downloads directory and download the source files from

mkdir $HOME/downloads
cd $HOME/downloads

Now (still in $HOME/downloads) we can build courier-authlib:

sudo rpmbuild -ta courier-authlib-0.63.0.tar.bz2

After the build process, the rpm packages can be found in /root/rpmbuild/RPMS/x86_64 (/root/rpmbuild/RPMS/i386 if you are on an i386 system). The command

sudo ls -l /root/rpmbuild/RPMS/x86_64

shows you the available rpm packages:

[[email protected] downloads]$ sudo ls -l /root/rpmbuild/RPMS/x86_64
total 520
-rw-r--r-- 1 root root 123448 May 25 18:06 courier-authlib-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root 265144 May 25 18:06 courier-authlib-debuginfo-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  34876 May 25 18:06 courier-authlib-devel-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  17448 May 25 18:06 courier-authlib-ldap-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  13808 May 25 18:06 courier-authlib-mysql-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  13020 May 25 18:06 courier-authlib-pgsql-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   8276 May 25 18:06 courier-authlib-pipe-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  34108 May 25 18:06 courier-authlib-userdb-0.63.0-1.fc15.x86_64.rpm
[[email protected] downloads]$

Select the ones you want to install, and install them like this:

sudo rpm -ivh /root/rpmbuild/RPMS/x86_64/courier-authlib-0.63.0-1.fc15.x86_64.rpm /root/rpmbuild/RPMS/x86_64/courier-authlib-mysql-0.63.0-1.fc15.x86_64.rpm /root/rpmbuild/RPMS/x86_64/courier-authlib-devel-0.63.0-1.fc15.x86_64.rpm

Now we go back to our downloads directory:

cd $HOME/downloads

Run the following commands to create required directories/change directory permissions (because otherwise the build process for Courier-Imap will fail):

sudo mkdir /var/cache/ccache/tmp
sudo chmod o+rwx /var/cache/ccache/
sudo chmod 777 /var/cache/ccache/tmp

Now run rpmbuild again, this time without sudo, otherwise the compilation will fail because it was run as root:

rpmbuild -ta courier-imap-4.9.3.tar.bz2

After the build process, the rpm packages can be found in $HOME/rpm/RPMS/x86_64 ($HOME/rpm/RPMS/i386 if you are on an i386 system):

cd $HOME/rpm/RPMS/x86_64

The command

ls -l

shows you the available rpm packages:

[[email protected] x86_64]$ ls -l
total 1040
-rw-rw-r-- 1 falko falko 315872 May 25 18:33 courier-imap-4.9.3-1.15.x86_64.rpm
-rw-rw-r-- 1 falko falko 743200 May 25 18:33 courier-imap-debuginfo-4.9.3-1.15.x86_64.rpm
[[email protected] x86_64]$

You can install courier-imap like this:

sudo rpm -ivh courier-imap-4.9.3-1.15.x86_64.rpm

Now we go back to our downloads directory:

cd $HOME/downloads

and run rpmbuild again, this time to build a maildrop package:

sudo rpmbuild -ta maildrop-2.5.4.tar.bz2

After the build process, the rpm packages can be found in /root/rpmbuild/RPMS/x86_64 (/root/rpmbuild/RPMS/i386 if you are on an i386 system). The command

sudo ls -l /root/rpmbuild/RPMS/x86_64

shows you the available rpm packages:

[[email protected] downloads]$ sudo ls -l /root/rpmbuild/RPMS/x86_64
total 1628
-rw-r--r-- 1 root root 123448 May 25 18:06 courier-authlib-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root 265144 May 25 18:06 courier-authlib-debuginfo-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  34876 May 25 18:06 courier-authlib-devel-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  17448 May 25 18:06 courier-authlib-ldap-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  13808 May 25 18:06 courier-authlib-mysql-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  13020 May 25 18:06 courier-authlib-pgsql-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   8276 May 25 18:06 courier-authlib-pipe-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  34108 May 25 18:06 courier-authlib-userdb-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root 278520 May 25 18:50 maildrop-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root 685672 May 25 18:50 maildrop-debuginfo-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root  99924 May 25 18:50 maildrop-devel-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root  63968 May 25 18:50 maildrop-man-2.5.4-1.15.x86_64.rpm
[[email protected] downloads]$

You can now install maildrop like this:

sudo rpm -ivh /root/rpmbuild/RPMS/x86_64/maildrop-2.5.4-1.15.x86_64.rpm

After you have compiled and installed all needed packages, you can become root again by typing



5 Apply Quota Patch To Postfix

We have to get the Postfix source rpm, patch it with the quota patch, build a new Postfix rpm package and install it.

cd /usr/src
rpm -ivh postfix-2.8.2-2.fc15.src.rpm

The last command will show some warnings that you can ignore:

warning: user mockbuild does not exist - using root
warning: group mockbuild does not exist - using root
cd /root/rpmbuild/SOURCES
cd /root/rpmbuild/SPECS/

Now we must edit the file postfix.spec:

vi postfix.spec

Add Patch0: postfix-vda-v10-2.8.2.patch to the # Patches stanza, and %patch0 -p1 -b .vda-v10 to the %setup -q stanza:

# Patches

Patch0: postfix-vda-v10-2.8.2.patch
Patch1: postfix-2.7.0-config.patch
Patch2: postfix-2.6.1-files.patch
Patch3: postfix-alternatives.patch
Patch8: postfix-large-fs.patch
Patch9: pflogsumm-1.1.3-datecalc.patch
%setup -q
# Apply obligatory patches
%patch0 -p1 -b .vda-v10
%patch1 -p1 -b .config
%patch2 -p1 -b .files
%patch3 -p1 -b .alternatives
%patch8 -p1 -b .large-fs

Then we build our new Postfix rpm package with quota and MySQL support:

rpmbuild -ba postfix.spec

Our Postfix rpm package is created in /root/rpmbuild/RPMS/x86_64 (/root/rpmbuild/RPMS/i386 if you are on an i386 system), so we go there:

cd /root/rpmbuild/RPMS/x86_64

The command

ls -l

shows you the available packages:

[[email protected] x86_64]# ls -l
total 8308
-rw-r--r-- 1 root root  123528 Jun 20 16:33 courier-authlib-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  265100 Jun 20 16:33 courier-authlib-debuginfo-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   34876 Jun 20 16:33 courier-authlib-devel-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   17452 Jun 20 16:33 courier-authlib-ldap-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   13812 Jun 20 16:33 courier-authlib-mysql-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   13040 Jun 20 16:33 courier-authlib-pgsql-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root    8280 Jun 20 16:33 courier-authlib-pipe-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root   34144 Jun 20 16:33 courier-authlib-userdb-0.63.0-1.fc15.x86_64.rpm
-rw-r--r-- 1 root root  278628 Jun 20 18:29 maildrop-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root  685320 Jun 20 18:29 maildrop-debuginfo-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root   99920 Jun 20 18:29 maildrop-devel-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root   63964 Jun 20 18:29 maildrop-man-2.5.4-1.15.x86_64.rpm
-rw-r--r-- 1 root root 2170848 Jun 20 18:40 postfix-2.8.2-2.fc15.x86_64.rpm
-rw-r--r-- 1 root root 4599208 Jun 20 18:40 postfix-debuginfo-2.8.2-2.fc15.x86_64.rpm
-rw-r--r-- 1 root root   63536 Jun 20 18:40 postfix-perl-scripts-2.8.2-2.fc15.x86_64.rpm
[[email protected] x86_64]#

Pick the Postfix package and install it like this:

rpm -ivh postfix-2.8.2-2.fc15.x86_64.rpm
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By: Anonymous

At the part where the newly built, patched postfix package is installed, rather that using:

rpm -ivh postfix-2.8.2-2.fc15.x86_64.rpm

 may I suggest using:

 yum localinstall postfix-2.8.2-2.fc15.x86_64.rpm

 as this helps yum keep from complaining about having altered the RPM database outside of using yum?

 Great article just the same.