Preliminary note
================

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined
by RFC 5321, with some additional standart extensions.

It allows ordinary machines to exchange e-mails with other systems speaking
the SMTP protocol.

OpenSMTPD runs on top of the OpenBSD operating system but also has a portable
version that can build and run on several systems, including:

* Linux
* FreeBSD
* NetBSD
* DragonFly
* MacOSX

For more information: [http://www.opensmtpd.org/portable.html](http://www.opensmtpd.org/portable.html)

People interested about OpenSMTPD are encouraged to subscribe to our mailing
list: [http://www.opensmtpd.org/list.html](http://www.opensmtpd.org/list.html)

and to join the IRC channel: #OpenSMTPD @ irc.freenode.net

Cheers !


How to build, configure and use Portable OpenSMTPD
==================================================

Dependencies
------------

Portable OpenSMTPD relies on:
* [autoconf](http://www.gnu.org/software/autoconf/)
* [automake](http://www.gnu.org/software/automake/)
* [Berkeley DB](http://www.oracle.com/technetwork/products/berkeleydb/overview/index.html) to be built with --enable-compat185 configure flag
* [bison](http://www.gnu.org/software/bison/) (or [byacc](http://invisible-island.net/byacc/byacc.html))
* [libevent](http://libevent.org/)
* [libtool](http://www.gnu.org/software/libtool/)
* [openssl](http://www.openssl.org/)


Get the source
--------------

    git clone -b portable git://github.com/poolpOrg/OpenSMTPD.git opensmtpd

or

    wget http://www.opensmtpd.org/archives/opensmtpd-portable-latest.tar.gz
    tar xzvf opensmtpd-portable-latest.tar.gz


Build
-----

    cd opensmtpd*
    ./bootstrap  # Only if you build from git sources
    ./configure  
    make  
    sudo make install  

### Special notes for FreeBSD/DragonFlyBSD/Mac OS X:

Please launch configure with special directive about libevent directory:

#### FreeBSD:

    ./configure --with-libevent-dir=/usr/local

#### DragonFlyBSD:

    ./configure --with-libevent-dir=/usr/pkg

#### Mac OS X:

    ./configure --with-libevent-dir=/opt/local
    make CFLAGS="-DBIND_8_COMPAT=1"


Install
-------

    sudo make install    


Configure /etc/smtpd.conf
-------------------------

Please have a look at the complete format description of [smtpd.conf configuration file](http://opensmtpd.org/smtpd.conf.5.html)


Add OpenSMTPD users
-------------------

To operate, OpenSMTPD requires at least one user, by default _smtpd; and
preferably two users, by default _smtpd and _smtpq.

Using two users instead of one will increase security by a large factor so...
unless you want to voluntarily reduce security or you have absolute more faith in our code than we do, by all means use two.


The instructions below assume the default users however, the configure
script allows overriding these using the options:
--with-privsep-user, --with-queue-user.


### NetBSD, Linux (Debian, ArchLinux, ...)

    mkdir /var/empty  
    useradd -c "SMTP Daemon" -d /var/empty -s /sbin/nologin _smtpd
    useradd -c "SMTP queue user" -d /var/empty -s /sbin/nologin _smtpq

### DragonFlyBSD, FreeBSD

    pw useradd _smtpd -c "SMTP Daemon" -d /var/empty -s /sbin/nologin
    pw useradd _smtpq -c "SMTP queue user" -d /var/empty -s /sbin/nologin

### Mac OS X

First we need a group with an unused GID below 500, list the current ones used:

	/usr/bin/dscl . -list /Groups PrimaryGroupID | sort -n -k2,2

Add a group - here we have picked 444:

	/usr/bin/sudo /usr/bin/dscl . -create /Groups/_smtpd PrimaryGroupID 444

Then the user. Again we need an unused UID below 500, list the current ones used:

	/usr/bin/dscl . -list /Users UniqueID | sort -n -k2,2

Add a user - here we have picked 444:

	/usr/bin/sudo /usr/bin/dscl . -create /Users/_smtpd UniqueID 444
	/usr/bin/sudo /usr/bin/dscl . -delete /Users/_smtpd AuthenticationAuthority
	/usr/bin/sudo /usr/bin/dscl . -delete /Users/_smtpd PasswordPolicyOptions
	/usr/bin/sudo /usr/bin/dscl . -delete /Users/_smtpd dsAttrTypeNative:KerberosKeys
	/usr/bin/sudo /usr/bin/dscl . -delete /Users/_smtpd dsAttrTypeNative:ShadowHashData
	/usr/bin/sudo /usr/bin/dscl . -create /Users/_smtpd RealName "SMTP Daemon"
	/usr/bin/sudo /usr/bin/dscl . -create /Users/_stmpd Password "*"
	/usr/bin/sudo /usr/bin/dscl . -create /Users/_smtpd PrimaryGroupID 444
	/usr/bin/sudo /usr/bin/dscl . -create /Users/_smtpd NFSHomeDirectory /var/empty
	/usr/bin/sudo /usr/bin/dscl . -create /Users/_smtpd UserShell /usr/bin/false

repeat for the _smtpq user.


Launch smtpd
------------

First, kill any running sendmail/exim/qmail/postfix or other.

Then:

    smtpd &

or in debug and verbose mode

    smtpd -dv