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IndiMail Release 1.3


IndiMail is a Scalable, Secure, Reliable, Efficient, and a highly
configurable Mailing Solution. IndiMail allows Users in a domain to be
distributed across multiple hosts (without NFS). IndiMail has multiple
queues to provide a high speed queuing. IndiMail uses a heavily modifed version of qmail.

IndiMail also provides programs to manage Virtual Domains and large number of users in Virtual Domains. These users can be distributed across multiple hosts. A high speed query lookup daemon (inlookup) allows IndiMail to handle large number of queries with MySQL as the RDBMS.

By default, IndiMail provides an authentication module for Courier IMAP called authindi. It also provides a Password Lookup Service using Name Service Swith (NSS). This allows any IMAP/POP3 server to work with IndiMail as long as the IMAP/POP3 server provides for authentication of users agains the system's /etc/passwd, /etc/shadow. The Password Lookup Service extends the system's getpwnam() family of functions to work with IndiMail's MySQL database without making any code changes to IMAP/POP3 server. Hence theoritically IndiMail can be used with almost any IMAP/POP3 server.

IndiMail has been undergoing several changes especially on simplification of Installation. After quite a few testing with some users of IndiMail, many of the Install issues have been sorted out. I am happy to release IndiMail Version 1.3 which fixes quite a few Installation issues. The file INSTALL has been overhauled.

IndiMail uses supervise (part of daemontools package) to startup and monitor all services. This allows IndiMail to achieve very high uptimes. IndiMail also uses envdir as part of its startup script. This allows all all configuration items to be easily configured by changing environment variables or simple text files called Control Files. A tool called svctool, with command-line options which helps you to configure any configuration item in IndiMail (creation of supervise scripts, qmail configuration, installation of all default MySQL tables, creation of default aliases, users, etc).

There are four Mailing Lists for IndiMail

  1. indimail-support - You can subscribe for Support at You can email for posting messages to this list.
  2. indimail-devel - You can subscribe at
  3. indimail-announce - This is only meant for announcement of New Releases or patches. You can subscribe at You can email for posting messages to this list.
  4. Archive at Google - This group acts as a remote archive. Any discussions posted here goes to indimail-support.
There is also a Project Tracker for IndiMail (Bugs, Feature Requests, Patches, Support Requests) at

Summary of Changes in 1.3

  1. Added dumpconfig command in svctool. To show all variables configured in supervise.
  2. Made Changes and Corrected typos in INSTALL.
  3. Fixed INSTALLATION issues. Modifed file INSTALL,,, bootstrap
  4. Added function backfill to fill empty slots left (by deleting users) in dir_control
  5. Create queue_base control file when creating queues
  6. Added --sql-mode=NO_BACKSLASH_ESCAPES
  7. Added documentation for training bogofilter.
  8. Created wordlist.db from corpus at
  9. Create empty wordlist.db if wordlist.db does not exist
  10. Changed to fix dependencies of qmail on IndiMail
  11. Completed backfill code for dir_control
  12. Locking can now be specified in --enable-file-locking=y|n|s||l||f. Which allows one to use flock(), semaphores or links for providing locking operations.
  13. Fixed remove_line() removing all matched line. New option now to remove only the first matched line.


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IndiMail Installation for newbies in < 10 steps

Installing Indimail using YUM/APT Repository Install OS
openSUSE Leap 42.3
openSUSE Leap 42.2
openSUSE 13.2
openSUSE 13.1
SUSE Linux Enterprise 12 SP2
SUSE Linux Enterprise 12 SP1
SUSE Linux Enterprise 12
Red Hat
Feodra 27
Fedora 26
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CentOS 7
CentOS 6
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Debian 7.0
Ubuntu 17.04
Ubuntu 16.10
Ubuntu 16.04
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Click the below URL for Install Instructions Shutdown MySQL if already running and disable MySQL from being started up by the system % /etc/init.d/mysqld stop % sudo chkconfig mysqld off % /bin/rm -f /service/mysql.3306/down
Start IndiMail
% sudo service indimail start Check Servicess
% sudo /usr/bin/svstat /service/* /service/clamd: up (pid 1014) 2985 seconds /service/dnscache: up (pid 1021) 2985 seconds /service/fetchmail: down 2985 seconds /service/freshclam: up (pid 1020) 2…

The AdminClient Protocol

IndiMail provides close to around 300 different programs as part of a flexible Enterprise Messaging Platform. You can carry administer the entire platform with around 45 of these programs. A program called indisrvr(8) provides a way for users to secure execute these commands from any remote location. To execute these programs, you need to have an admin account on the IndiMail server. These accounts can be created by the mgmtpass(8) program. Once you have an admin account on the IndiMail server, you can further restrict users to certain programs using the vpriv(8) program. vpriv can further modify privileges by allowing only certain options within a allowed program.

To execute these programs on the IndiMail server, you need to connect to port 4000 and use the adminclient protocol. The adminclient protocol is described below by showing a conversation between a client and the server 'indisrvr'

s - denotes server
c - denotes client

        s: "Login: "
        c: "u…

Writing Filters for IndiMail

IndiMail provides multiple methods by which you can intercept an email in transit and modify the email headers or the email body. A filter is a simple program that expects the raw email on standard input and outputs the message text back on standard output. The program /bin/cat can be used as a filter which simply copies the standard input to standard output without modifying anything. Some methods can be used before the mail gets queued and some methods can be used before the execution of local / remote delivery.

It is not necessary for a filter to modify the email. You can have a filter just to extract the headers or body and use that information for some purpose. IndiMail also provides the following programs - 822addr(1), 822headerfilter(1), 822bodyfilter(1), 822field(1), 822fields(1), 822header(1), 822body(1), 822headerok(1), 822received(1), 822date(1), 822fields(1) to help in processing emails.

Let us say that we have written a script /usr/local/bin/myfilter. The myfilter program …