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IndiMail now has a RPM and Yum repository

Using Red Hat Package Manager (RPM) is a popular way of installing software on Linux systems. I have been always comfortable with the usual ./configure; make; sudo make install-strip.

Not everyone is comfortable with gory details involved during compilation. So with some effort I started reading RPM manuals on the net. The first two days I found it quite tough getting things together but after the exercise, the knowledge gained has helped me to tweak the configure scripts and makefiles better.

IndiMail now longer uses hard-coded directories inside Makefiles. Libraries for example now go into @libdir@ in This resolves to /usr/lib on 32 bit systems and /usr/lib64 on 64 bit systems.

The biggest learning came from Open Build Server (OBS). The service provides software developers with a tool to create and release open source software for openSUSE and other Linux distributions easily on different hardware architectures and for a broad user audience. Users can easily find the latest open source packages they are looking for and customize them.
The biggest advantage of OBS is that it is quite unforgiving. It took me 4 complete days before I could generate the first successful RPM package. Compared to that, building the RPM on my own laptop was trivial.

Currently, the list of supported distributions for IndiMail is (for both 32 and 64 bit)
  • SUSE
    • openSUSE 11.2
    • openSUSE 11.1
    • openSUSE 11.0
    • SUSE Linux Enterprise 11
    • SUSE Linux Enterprise 10
    • openSUSE Factory
  • Red Hat
    • Fedora 13
    • Fedora 12
    • Fedora 11
    • Fedora 10
    • Red Hat Enterprise Linux 5
    • CentOS 5
  • Mandriva Linux
    • Mandriva 2010
    • Mandriva 2009.1
    • Mandriva 2009
The RPM's can be downloaded here. You will find directories for the above Linux distros. Each directory has a Yum Repository file. You can save the .repo file in /etc/yum.repos.d for yum to automatically download and install IndiMail. The RPM are part of IndiMail from Release 1.3.4.
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openSUSE 13.1
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SUSE Linux Enterprise 12 SP1
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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 …