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Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Fedora 13 x86_64)
Version 1.0
Author: Falko Timme 
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This tutorial is Copyright (c) 2010 by Falko Timme. It is derived from a tutorial from Christoph Haas which you can find at http://workaround.org. 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 mail server based on Postfix 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 13 x86_64, so you should set up a basic Fedora 13 server installation before you continue with this tutorial (e.g. as shown in the first six chapters of The Perfect Server - Fedora 13 x86_64 [ISPConfig 3]). The system should have a static IP address. I use 192.168.0.100 as my IP address in this tutorial and server1.example.com 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
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:
Run
visudo
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/BUILDROOT
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 http://www.courier-mta.org/download.php:
mkdir $HOME/downloads
cd $HOME/downloads
wget https://sourceforge.net/projects/courier/files/authlib/0.63.0/courier-authlib-0.63.0.tar.bz2/download
wget https://sourceforge.net/projects/courier/files/imap/4.8.0/courier-imap-4.8.0.tar.bz2/download
wget https://sourceforge.net/projects/courier/files/maildrop/2.5.0/maildrop-2.5.0.tar.bz2/download
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 $HOME/rpm/RPMS/x86_64 ($HOME/rpm/RPMS/i386 if you are on an i386 system):
cd $HOME/rpm/RPMS/x86_64
The command
ls -l
shows you the available rpm packages:
[falko@server1 x86_64]$ ls -l
total 516
-rw-r--r-- 1 root root 124304 Jun 10 17:48 courier-authlib-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 258896 Jun 10 17:48 courier-authlib-debuginfo-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 35064 Jun 10 17:48 courier-authlib-devel-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 17424 Jun 10 17:48 courier-authlib-ldap-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 13956 Jun 10 17:48 courier-authlib-mysql-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 13120 Jun 10 17:48 courier-authlib-pgsql-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 8328 Jun 10 17:48 courier-authlib-pipe-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 34160 Jun 10 17:48 courier-authlib-userdb-0.63.0-1.fc13.x86_64.rpm
[falko@server1 x86_64]$
Select the ones you want to install, and install them like this:
sudo rpm -ivh courier-authlib-0.63.0-1.fc13.x86_64.rpm courier-authlib-mysql-0.63.0-1.fc13.x86_64.rpm courier-authlib-devel-0.63.0-1.fc13.x86_64.rpm
Now we go back to our downloads directory:
cd $HOME/downloads
and run rpmbuild again, this time without sudo, otherwise the compilation will fail because it was run as root:
rpmbuild -ta courier-imap-4.8.0.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 $HOME/rpm/RPMS/x86_64
The command
ls -l
shows you the available rpm packages:
[falko@server1 x86_64]$ ls -l
total 2300
-rw-r--r-- 1 root root 124304 Jun 10 17:48 courier-authlib-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 258896 Jun 10 17:48 courier-authlib-debuginfo-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 35064 Jun 10 17:48 courier-authlib-devel-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 17424 Jun 10 17:48 courier-authlib-ldap-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 13956 Jun 10 17:48 courier-authlib-mysql-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 13120 Jun 10 17:48 courier-authlib-pgsql-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 8328 Jun 10 17:48 courier-authlib-pipe-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 34160 Jun 10 17:48 courier-authlib-userdb-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 falko falko 632296 Jun 10 17:58 courier-imap-4.8.0-1.13.x86_64.rpm
-rw-r--r-- 1 falko falko 1188976 Jun 10 17:58 courier-imap-debuginfo-4.8.0-1.13.x86_64.rpm
[falko@server1 x86_64]$
You can install courier-imap like this:
sudo rpm -ivh courier-imap-4.8.0-1.13.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-2.5.0.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 $HOME/rpm/RPMS/x86_64
The command
ls -l
shows you the available rpm packages:
[falko@server1 x86_64]$ ls -l
total 5400
-rw-r--r-- 1 root root 124304 Jun 10 17:48 courier-authlib-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 258896 Jun 10 17:48 courier-authlib-debuginfo-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 35064 Jun 10 17:48 courier-authlib-devel-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 17424 Jun 10 17:48 courier-authlib-ldap-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 13956 Jun 10 17:48 courier-authlib-mysql-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 13120 Jun 10 17:48 courier-authlib-pgsql-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 8328 Jun 10 17:48 courier-authlib-pipe-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 34160 Jun 10 17:48 courier-authlib-userdb-0.63.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 falko falko 632296 Jun 10 17:58 courier-imap-4.8.0-1.13.x86_64.rpm
-rw-r--r-- 1 falko falko 1188976 Jun 10 17:58 courier-imap-debuginfo-4.8.0-1.13.x86_64.rpm
-rw-r--r-- 1 root root 1759056 Jun 10 18:06 maildrop-2.5.0-1.13.x86_64.rpm
-rw-r--r-- 1 root root 1243400 Jun 10 18:06 maildrop-debuginfo-2.5.0-1.13.x86_64.rpm
-rw-r--r-- 1 root root 99764 Jun 10 18:06 maildrop-devel-2.5.0-1.13.x86_64.rpm
-rw-r--r-- 1 root root 62536 Jun 10 18:06 maildrop-man-2.5.0-1.13.x86_64.rpm
[falko@server1 x86_64]$
You can now install maildrop like this:
sudo rpm -ivh maildrop-2.5.0-1.13.x86_64.rpm
After you have compiled and installed all needed packages, you can become root again by typing
exit
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
wget http://ftp-stud.fht-esslingen.de/pub/Mirrors/fedora/linux/releases/13/Fedora/source/SRPMS/postfix-2.7.0-1.fc13.src.rpm
rpm -ivh postfix-2.7.0-1.fc13.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
wget http://vda.sourceforge.net/VDA/postfix-vda-2.7.0.patch
cd /root/rpmbuild/SPECS/
Now we must edit the file postfix.spec:
vi postfix.spec
Add Patch0: postfix-vda-2.7.0.patch to the # Patches stanza, and %patch0 -p1 -b .vda to the %setup -q stanza:
[...] # Patches Patch0: postfix-vda-2.7.0.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-1.1.2-datecalc.patch [...] %prep %setup -q # Apply obligatory patches %patch0 -p1 -b .vda %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:
[root@server1 x86_64]# ls -l
total 8804
-rw-r--r-- 1 root root 2197708 Jun 10 18:17 postfix-2.7.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 6746304 Jun 10 18:17 postfix-debuginfo-2.7.0-1.fc13.x86_64.rpm
-rw-r--r-- 1 root root 61460 Jun 10 18:17 postfix-perl-scripts-2.7.0-1.fc13.x86_64.rpm
[root@server1 x86_64]#
Pick the Postfix package and install it like this:
rpm -ivh postfix-2.7.0-1.fc13.x86_64.rpm
