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2.2. Configuration
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 favorite 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.
At any time, you should not edit the master configuration file, /var/lib/exim4/ config.autogenerated manually. It is updated automatically every time you run update- exim4.conf
You can run the following command to start Exim4 daemon.
sudo systemctl start exim4.service