Quickstart Guide
****************

* Introduction to Cyrus IMAP

  * What is IMAP?


Quick install
=============

A quick guide to getting a basic installation of Cyrus up and running
in 5 minutes.

The first place to start with a new installation of Cyrus IMAP is with
your OS distribution of choice and their packaging, where available.

If there is no Cyrus IMAP 3.10.0-beta1 package available yet from your
distro, download the official source tarball from GitHub.  The
Compiling guide will help you get it built and installed.


1. Install Cyrus package(s)
---------------------------

Install the Cyrus IMAP package(s), either from your distribution's
package manager, or from a release tarball.

Your distribution might have split Cyrus IMAP into several packages.
Check their documentation if you're not sure what you need.


2. Setup the cyrus:mail user and group
--------------------------------------

Now let's create a **special user account just for the Cyrus server**
to sandbox Cyrus: called "cyrus". We'll also create a "mail" group as
well. This allows Cyrus to give other programs some permissions if
they are run under the "mail" group, again, without causing a Cyrus
bug to delete all of your cat pictures. Disaster!

If you have installed from packages, your package vendor may have
already done this for you.  To check, use these commands:

   $ getent group mail
   mail:x:8:

   $ getent passwd cyrus
   cyrus:x:999:8:Cyrus IMAP Server:/var/lib/imap:/bin/bash

Example group and user creation commands for GNU/Linux:

   groupadd -fr mail
   useradd -c "Cyrus IMAP Server" -d /var/lib/imap -g mail -s /bin/bash -r cyrus

The "var/lib/imap" directory above is an example. Use the same
directory specified in the "configdirectory" option in imapd.conf(5).


configdirectory
^^^^^^^^^^^^^^^

*This shows the default value: change it in imapd.conf to suit your
needs.*

   "configdirectory:" <none>

      The pathname of the IMAP configuration directory.  This field is
      required.

If your installation uses system locations for things like SSL
certificates (i.e. "/etc/ssl/certs /etc/ssl/private"), then you should
also add the "cyrus" user to the appropriate group to gain access to
the PKI files.  On Debian/Ubuntu systems, for example, this group is
"ssl-cert":

   usermod -aG ssl-cert cyrus


3. Setting up authentication with SASL
--------------------------------------

Now, let's set up **SASL**. This will allow you to connect to your
local IMAP server and login, just like any IMAP user would before
checking for new emails.

Create a "saslauth" group and add the "cyrus" user to the group, so
Cyrus can access SASL. (on Debian, this group is called 'sasl': adjust
the following commands to suit.)

   groupadd -fr saslauth
   usermod -aG saslauth cyrus

Change the default SASL configuration in "/etc/default/saslauthd".
   1. Make sure that the "START" option is set to *yes* "(START=yes)"
      and

   2. Set the``MECHANISMS`` option to **sasldb**
      "(MECHANISMS="sasldb")".

Start the SASL auth daemon:

   /etc/init.d/saslauthd start

Now, we'll create the IMAP user inside SASL. This is the user you'll
use to login to the IMAP server later on.

   echo 'secret' | saslpasswd2 -p -c imapuser

You can replace "secret" with a more suitable password you want and
"imapuser" with the username you want. Once this is done, check that
the user exists and is set up correctly:

   testsaslauthd -u imapuser -p secret -f /var/run/saslauthd/mux

You should get an "0: OK "Success."" message.


4. Setup mail delivery from your MTA
------------------------------------

Your Cyrus IMAP server will want to receive the emails accepted by
your SMTP server (ie Sendmail, Postfix, Exim). See Mail delivery from
your MTA.


5. Protocol ports
-----------------

The Cyrus IMAP server provides service interfaces via either TCP/IP
ports or Unix domain sockets.  For the former, Cyrus requires that
there are proper entries in the host's "/etc/services" file.  The
following are required for any host using the listed services:

   pop3      110/tcp  # Post Office Protocol v3
   nntp      119/tcp  # Network News Transport Protocol
   imap      143/tcp  # Internet Mail Access Protocol rev4
   nntps     563/tcp  # NNTP over TLS
   imaps     993/tcp  # IMAP over TLS
   pop3s     995/tcp  # POP3 over TLS
   kpop      1109/tcp # Kerberized Post Office Protocol
   lmtp      2003/tcp # Lightweight Mail Transport Protocol service
   smmap     2004/tcp # Cyrus smmapd (quota check) service
   csync     2005/tcp # Cyrus replication service
   mupdate   3905/tcp # Cyrus mupdate service
   sieve     4190/tcp # timsieved Sieve Mail Filtering Language service

Make sure that these lines are present or add them if they are
missing.


6. Configuring Cyrus
--------------------

(Nearly there)

Set up a simple directory structure for Cyrus to store emails, owned
by the "cyrus" user and group "mail":

   sudo mkdir -p /var/lib/cyrus /var/spool/cyrus
   sudo chown -R cyrus:mail /var/lib/cyrus /var/spool/cyrus
   sudo chmod 750 /var/lib/cyrus /var/spool/cyrus

The "/var/spool/cyrus" directory is the partition where Cyrus will
store mail and must be allocated sufficient storage. The exact
location can be configured in imapd.conf(5) in the partitions options.

Following installation, a fairly comprehensive set of sample
configuration files may be found in "/usr/share/doc/cyrus-
doc/examples/".  Select one from each of the "cyrus_conf" and
"imapd_conf" directories, and install as "/etc/cyrus.conf" and
"/etc/imapd.conf" respectively.

A basic description of these files:

* Stand-alone server configurations (pick one):

  * small.conf
       A simple small server

  * normal.conf
       A more typical server

  * prefork.conf
       As above, but with several server processes pre-forked for
       faster connection initialization.

  Note:

    The "normal.conf" file in the "imapd_conf" directory is intended
    to work with any of the above files from the "cyrus_conf"
    directory.

* Cyrus Aggregation - Murder -- configurations (these constitute a
  set, with at least one of each required):

  * murder-mupdate.conf
       The Mupdate Master server; holds the canonical copy of the
       "mailboxes.db" database.

  * murder-backend.conf
       A backend server which holds the actual mailboxes and interacts
       with frontend proxies and/or clients.

  * murder-frontend.conf
       A frontend server which holds no mailboxes, but either refers
       clients to the proper backend server for each requests, or
       proxies those requests directly.

* Replication configurations (these constitute a set, with one master
  and at least one replica required):

  * normal-master.conf
       The master server which uses the "sync_client" program to send
       mailbox updates to each replica on a rolling or periodic basis.

  * normal-replica.conf
       A typical replica server, which accepts updates from the
       master.

  Note:

    When working with replication or aggregation (Murder), the example
    files in "cyrus_conf" and "imapd_conf" of the same name are
    intended to be used together.

You should review each of these and then install as desired to
"/etc/", making changes as needed.  In particular, you'll need to set
passwords for the various users used to authenticate between instances
in a Murder or Replication environment.

For example:

   install -m 600 doc/examples/cyrus_conf/normal.conf /etc/cyrus.conf
   install -m 600 doc/examples/imapd_conf/normal.conf /etc/imapd.conf
   vi /etc/imapd.conf
   ...
   vi /etc/cyrus.conf
   ...


7. Launch Cyrus
---------------

If using a distribution package, you probably now have an init script
installed, that you can invoke with your system's usual service
control mechanism.

If you built from source, you will need to write your own init script.
The simplest one will simply start/stop the master(8) binary, with
suitable options, as root (master will drop root privileges itself as
soon as it possibly can).
