Exim4 is another Message Transfer Agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the internet. Exim can be installed in place of sendmail, although the configuration of exim is quite different to that of sendmail.
To install exim4, run the following command:
sudo apt-get install exim4 exim4-base exim4-config
To configure exim4, run the following command:
sudo dpkg-reconfigure exim4-config
The user interface will be displayed. The user interface lets you configure many parameters. For example, In exim4 the configuration files are split among multiple files. If you wish to have them in one file you can configure accordingly in this user interface.
All the parameters you configure in the user interface are
stored in
/etc/exim4/update-exim4.conf.conf file.
If you wish to re-configure, either you re-run the
configuration wizard or manually edit this file
using your favourite editor. Once you configure, you can run
the following command to generate the master configuration
file:
sudo update-exim4.conf
The master configuration file, is generated and
it is stored in
/var/lib/exim4/config.autogenerated.
![[Warning]](../../images/admon/warning.png)
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At any time, you should not edit the master configuration
file,
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You can run the following command to start exim4 daemon.
sudo /etc/init.d/exim4 start
TODO: This section should cover configuring SMTP AUTH with exim4.
