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Preliminary note
================
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as
defined by RFC 5321, with some additional standard 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
For more information: http://www.opensmtpd.org/portable.html
People interested about OpenSMTPD are encouraged to subscribe to our
mailing list: http://www.opensmtpd.org/list.html
and to join the IRC channel: #OpenSMTPD @ irc.freenode.net
Also note that we have a wiki at
https://github.com/OpenSMTPD/OpenSMTPD/wiki that you are encouraged to
contribute to.
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/)
* 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/)
* libasr (https://opensmtpd.org/archives/libasr-1.0.2.tar.gz)
Get the source
--------------
git clone -b portable git://github.com/OpenSMTPD/OpenSMTPD.git opensmtpd
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 and
libasr directory:
# FreeBSD / DragonFlyBSD:
./configure --with-libasr=/usr/local
# Mac OS X:
./configure --with-libevent=/opt/local --with-libasr=/opt/local
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... if you want to voluntarily reduce security or you have absolute
more faith in our code than we do, by all means use one.
The instructions below assume the default users however, the configure
script allows overriding these using the options:
--with-user-smtpd, --with-user-queue, and --with-group-queue.
# NetBSD, Linux (Debian, Arch Linux, ...)
mkdir /var/empty
useradd -c "SMTP Daemon" -d /var/empty -s /sbin/nologin _smtpd
useradd -c "SMTPD Queue" -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 "SMTPD Queue" -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/_smtpd 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
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