Skip to main content

Delivery Instructions for a Virtual Domain

IndiMail uses a modified version of qmail as the MTA. For local deliveries, qmail-lspawn reads a series of local delivery commands from descriptor 0, invokes qmail-local to perform the deliveries. qmail-local reads a mail message and delivers to to a user by the procedure described in dot-qmail(5). IndiMail uses vdelivermail as the local delivery agent.

A virtual domain is created by the command vadddomain(1).

% vadddomain example.com some_password

The above command creates a virtual domain with delivery instructions in /var/indimail/domains/example.com/.qmail-default file. A line in this file is of the form

/var/indimail/sbin/vdelivermail '' delivery_instruction_for_non_existing_user

The delivery_instruction_for_non_existing_user can have one of the following 5 forms

  1. delete
  2. bounce-no-mailbox
  3. Maildir
  4. emailAddress
  5. IPaddress
Using delete as the delivery instruction causes IndiMail to discard all mails addressed to non-existing users. The original sender does not get notified of the delivery. On a real messaging system serving real users, you will not want to do this.

The instruction bounce-no-mailbox causes a bounce to be generated to the sender in case an email is addressed to a non-existing user. This is the most common usage in .qmail-default which most IndiMail installations will have

The instruction Maildir causes emails to be addressed to non-existing users to be saved in a Maildir. Here Maildir should refer to a full path of an existing Maildir.

The instruction emailAddress causes emails to be addressed to non-existing users to be forwarded to an email address emailAddress.

The instruction IPaddress causes emails to be addressed to non-existing users to be redirected to a remote SMTP server at IP IPaddress. The format of IPaddress is domain:ip:port where domain is the domain name, ip is the IP address of the remote SMTP server and port is the SMTP port on the remote SMTP server. It is expected that the non-existing user is present on the remote system. This type of delivery is used by IndiMail on a clustered setup. In a clustered setup, users are distributed across multiple server. A particular user will be located only on one particular server. However, the same domain will be present on multiple servers.

In the delivery instruction in .qmail-default, you can replace vdelivermail with vfilter to perform in-line filtering use IndiMail's poweful vfilter. You can create filters using the program vcfilter.

1 comment

Popular posts from this blog

IndiMail Installation for newbies in < 10 steps

Installing Indimail using YUM/APT Repository Install OS
OpenSUSE
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
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
CentOS 7
CentOS 6
Debian
Debian 8.0
Debian 7.0
Ubuntu 17.04
Ubuntu 16.10
Ubuntu 16.04
Ubuntu 14.04
Ubuntu 12.04
Click the below URL for Install Instructions
https://software.opensuse.org/download.html?project=home%3Aindimail&package=indimail 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…

Using Docker Engine to Run IndiMail / IndiMail-MTA

IndiMail now has docker images. You can read about installing Dockerhere. Once you have installed docker-engine, you need to start it. Typically it would be
$ sudo service docker start
To avoid having to use sudo when you use the docker command, create a Unix group called docker and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by the docker group.
Warning: The docker group is equivalent to the root user; For details on how this impacts security in your system, see Docker Daemon Attack Surface for details.$ sudo groupadd docker $ sudo usermod -aG docker your_username
Log out and login again to ensure your user is running with the correct permissions. You can run the unix id command to confirm that you have the docker group privileges. e.g.
$ id -a uid=1000(mbhangui) gid=1000(mbhangui) groups=1000(mbhangui),10(wheel),545(docker) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
Now we need to pull the docker image for I…

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 …