{{tag>en en:linux en:server en:mail}}
====== Exim 4 ======
Exim is the default mail service with [[debian]].\\
It's enough for most needs but must be configured to forward emails to a relay.
For company use, the relay is generally local, at home the relay is provided by the ISP.\\
For those who owns a gmail or google apps account, it is possible to use gmail as a relay.
===== Installation =====
Exim4 is installed by default, it's the following package :
* exim4
===== Setup =====
Exim setup is done with the command :
dpkg-reconfigure exim4-config
Installation types are :
* internet site : exim send emails directly to the destination server. Attention this option doesn't work with a common home access (Cable/xDSL) because IPs are blacklisted.
* mail sent by smarthost; received via SMTP or fetchmail : forward emails to a relay, accept local emails. To use if the server hold local mailboxes.
* mail sent by smarthost; no local mail : forward emails to a relay, no local mailbox. Allow the server to send emails, this options is generally used.
* local delivery only; not on a network : closed relay, only deliver to local mailboxes.
For a server that just needs to send email outside, we need to choice "mail sent by smarthost; no local mail".
The settings to configure are :
* System mail name (mailname) : the server name, for example debian.bouthors.fr
* IP-addresses to listen on for incoming SMTP connections : IP list allowed to send emails, for example 127.0.0.1.
* Other destinations for which mail is accepted : used to store mails on this server
* Visible domain name for local users : name used for local accounts when they send emails outside, par exemple bouthors.fr
* IP address or host name of the outgoing smarthost : IP of dns name of the relay, some examples :
* simple relay : 192.168.10.1
* SMTPS relay (port 587) : smtp.gmail.com::587
* 2 relays (the second one is used only if the first one is not available) : 192.168.10.1:192.168.10.2
* Keep number of DNS-queries minimal (Dial-on-Demand) : no
* Split configuration into small files? : no
To enable SMTP authentication, we need to edit the file ///etc/exim4/passwd.client// and some lines with this template :
smtp.serveur.com:nom:pass
Then execute :
update-exim4.conf
To check if it's working, just send an email with the "mail" command :
# mail a.valid.email@gmail.com
Subject: test
this is a test
.
Cc:
#
===== Example of gmail configuration =====
Steps :
* execute dpkg-reconfigure exim4-config
* General type of mail configuration : mail sent by smarthost; no local mail
* System mail name : bouthors.fr
* IP-addresses to listen on for incoming SMTP connections : 127.0.0.1
* Other destinations for which mail is accepted :
* Visible domain name for local users : bouthors.fr
* IP address or host name of the outgoing smarthost : smtp.gmail.com::587
* Keep number of DNS-queries minimal (Dial-on-Demand) : no
* Split configuration into small files? : no
* edit ///etc/exim4/passwd.client// :
# password file used when the local exim is authenticating to a remote
# host as a client.
#
# see exim4_passwd_client(5) for more documentation
#
# Example:
### target.mail.server.example:login:password
gmail-smtp.l.google.com:compte@bouthors.fr:*********
*.google.com:compte@bouthors.fr:*********
smtp.gmail.com:compte@bouthors.fr:*********
* execute update-exim4.conf
* restart exim : /etc/init.d/exim4 restart
Result config inside ///etc/exim4/update-exim4.conf.conf// :
# /etc/exim4/update-exim4.conf.conf
#
# Edit this file and /etc/mailname by hand and execute update-exim4.conf
# yourself or use 'dpkg-reconfigure exim4-config'
#
# Please note that this is _not_ a dpkg-conffile and that automatic changes
# to this file might happen. The code handling this will honor your local
# changes, so this is usually fine, but will break local schemes that mess
# around with multiple versions of the file.
#
# update-exim4.conf uses this file to determine variable values to generate
# exim configuration macros for the configuration file.
#
# Most settings found in here do have corresponding questions in the
# Debconf configuration, but not all of them.
#
# This is a Debian specific file
dc_eximconfig_configtype='satellite'
dc_other_hostnames=''
dc_local_interfaces='127.0.0.1'
dc_readhost='bouthors.fr'
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.gmail.com::587'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='true'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'
===== Backup =====
* /etc/exim4/update-exim4.conf.conf
* /etc/exim4/passwd.client
===== Links =====
* http://www.exim.org/
* http://wiki.debian.org/GmailAndExim4