Build A Full-Featured Mail Server On CentOS 6 With Postfix, Dovecot, PostgreSQL


We're going to set up a free, full-featured mail server on CentOS 6.2, all mail service related components are free and open source, and you have control over your own data. The installation process is extremly easy and smooth.

By following this tutorial, you will have below major software and services ready for production use:

  • Postfix: SMTP service
  • Dovecot: POP3/POP3S, IMAP/IMAPS, Managesieve service
  • PostgreSQL: Storing mail accounts and application data
  • Apache: Web server
  • Amavisd, SpamAssassin, ClamAV: Anti-spam, anti-virus
  • Roundcube: Webmail
  • Fail2ban: scans log files (e.g. /var/log/maillog) and bans IPs that show the malicious signs -- too many password failures, seeking for exploits, etc.
  • iRedAdmin: A basic, free & open source administration panel to manage the mail accounts. Full featured edition is available for purchase here:
  • Awstats: Apache and Postfix log analyzer
  • phpPgAdmin: web-based administration tool for PostgreSQL


Introduce iRedMail

Homepage of iRedMail project is here:

iRedMail is:

  • A ZERO COST, fully fledged, full-featured mail server solution. All components are free and open source software.
  • An open source project, released under GPLv2, hosted on BitBucket.

With iRedMail, you can set up a full-featured, zero-cost mail server in less than 2 minutes. iRedMail works on 8 major Linux/BSD distributions:

  • Red Hat Enterprise Linux 5.x, 6.x
  • CentOS 5.x, 6.x
  • Scientific Linux 5.x, 6.x
  • Debian 6.x (Squeeze)
  • Ubuntu 10.04 LTS, 11.10, 12.04
  • Linux Mint 12 (based on Ubuntu)
  • Gentoo Linux, the latest official release (or daily build) with the latest portage
  • openSUSE 12.1
  • FreeBSD 8.x, 9.x

The latest beta release of iRedMail, 0.8.0-beta4, supports PostgreSQL on RHEL/CentOS/Scientific Linux (6.x), Ubuntu (11.10, 12.04), FreeBSD.


System Requirements

WARNING: iRedMail is designed to be deployed on a FRESH server system, which means your server does NOT have mail related components installed, e.g. Apache, PostgreSQL, OpenLDAP, Postfix, Dovecot, Amavisd, etc. Otherwise it may override your existing files/configurations althought it will backup files before modifing, and it may be not working as expected.

To install iRedMail, you need:

  • A FRESH, minimal working CentOS Linux 6. The latest 6.2 release is recommended.
  • At least 512MB of memory is required for production use.



Set A Fully Qualified Domain Name (FQDN) Hostname On Your Server

We need to set a FQDN hostname before we set up the mail server.

On CentOS Linux, hostname is set in two files:

Hostname setting: /etc/sysconfig/network

# Part of file: /etc/sysconfig/network

Hostname <=> IP address mapping: /etc/hosts. WARNING: Please list the FQDN hostname as the first item.

# Part of file: /etc/hosts demo localhost localhost.localdomain
Verify the FQDN hostname with command 'hostname -f'. If you change the hostname, please reboot the server to make it work.
$ hostname -f


Enable yum repositories for installing new packages

Please enable all default yum repositories in /etc/yum.repos.d/CentOS-Base.repo, and disable all third-party repositories. Repositories are enabled if you set "enabled=1" in the repo file.


Download The Latest Release Of iRedMail

Visit Download page to get the latest release of iRedMail. At least iRedMail-0.8.0-beta4 is required.

Upload iRedMail to your mail server via ftp or scp or whatever method you can use, login to the server to install iRedMail. We assume you uploaded it to directory /root/iRedMail-x.y.z.tar.bz2 (replace x.y.z by the actual version number).

Uncompress iRedMail tarball:

# cd /root/
# tar xjf iRedMail-x.y.z.tar.bz2


Start iRedMail Installer

It's now ready to start iRedMail installer, it will ask you some simple questions, that are all steps to set up a full-featured mail server.

# cd /root/iRedMail-x.y.z/
# bash


Screenshots Of iRedMail Installation

1) Welcome and thanks for your use:

2) Specify location to store all mailboxes. Default is /var/vmail/.

3) Choose backend used to store mail accounts. We will choose PostgreSQL for example in this tutorial, please choose the one which you're familiar with. You can manage mail accounts with iRedAdmin, our web-based iRedMail admin panel.

4) Set password of PostgreSQL admin user. PostgreSQL is used to store mail accounts and application data. e.g. Roundcube webmail, Amavisd-new.

5) Add your first mail domain name:

6) Set password of admin account of your first mail domain. NOTE:

  • This account is used only for system administration, not a mail user. That means you CANNOT login to webmail with this account.
  • You can login to iRedAdmin (web-based iRedMail admin panel) with this account for mail accont management, login name is full email address.
  • Admin username is hard-coded, you can create new admins with iRedAdmin after installation has completed.

7) Set password of first mail user of your first mail domain. NOTE:

  • This account is a normal mail user, that means you can login to webmail with this account, login name is full email address.
  • Username is hard-coded, you can create new mail users with iRedAdmin after installation has completed.

8) Choose optional components:

After these questions, iRedMail installer will ask you to confirm this installation. It will install and configure required packages automatically. Type y or Y and press Enter to confirm, type n or N and press Enter to cancel this installation.

Configuration completed.
***************************** WARNING ***********************************
*                                                                       *
* Please do remember to *MOVE* configuration file after installation    *
* completed successfully.                                               *
*                                                                       *
*   * /root/iRedMail-x.y.z/config
*                                                                       *
< Question > Continue? [y|N]

That's all you need to do to set up a free and full-featured mail server. Easy enough?


Important Things You Should Know After Installation

  • Read file /root/iRedMail-x.y.z/ first, it contains:
    • URLs, usernames and passwords of web-based applications
    • Location of mail serve related software configuration files
    • Some other important and/or sensitive information
  • Setup DNS record for SPF
  • Setup DNS record for DKIM


Access Webmail And Other Web Applications

After installation has successfully completed, you can access web-based programs if you choose to install them. Replace 'your_server' below by your actual server name or IP address.

  • Webmail: http://your_server/mail/ (or /webmail, /roundcube. HTTPS is available also.)
  • Admin panel: httpS://your_server/iredadmin/
  • phpMyAdmin: httpS://your_server/phpmyadmin/
  • Awstats: httpS://your_server/awstats/ (or ?config=smtp)


Get Technical Support

iRedMail project provides fast and effect online support, please post all issues, feedbacks, feature requests, suggestions in our online support forum, it's more responsible than you expected:

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7 Comment(s)

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By: Anonymous

Hi. Thanks for the tutorial. Its my first linux mail server to actually work ... or try to work. 

 I cant pop mails using outlook and i get the above error "Connection to IMAP Server Filed" when i try logging into webmail.

 I will greatly appreciate the kind gesture


By: Ravi

Restart IMAP server(i.e dovecot) and try again...If u get same error after the restart,check

the imap ports on your email client program

By: Nuwan

Dear all I  have two domain which  those are resisted on and hosted on .I Hope to Manage Mail server for those two Domain name then in my LAN I Installed CentOS 6.4 and then Installed iRedMail and after I Installed Fetch mail service also because my both domain Mail box I create on Hosting Cpanel. My requirement is fetch the mail from Hostgator mail Box to My Local  Server. from The Local mail server is Deliver to Clinet mail Box. Please let me know the method how can do it       




How many mailbox we can create on iRedMail Server?



By: E71

iRedMail's open source admin GUI is terrible. It's a waaaayyy too cut down version of iRedAdmin Pro.

Only worth using if you pay for a $500+ (!!!!!!!!) License for the Pro version, but um, no thanks.

By: jorge jorgenson

Hello, at the beginning I see FQDN settings whereas I am using Linux Mint and not finding the specific files named as such thanks.

By: John

I followed this guide a few years ago.  I currently have an account that is locked out due to bad password attempts and I am unable to login into this account.I can change the password in iredadmin but I still receive "too many bad password attempts."How do you remove an account lockout?