On ubuntu, xim4′ ‘configuration is based on template stored in /etc/exim4 (splitted or one block configuration template depending on your choice).
The real configuration file s’ ‘generated on the fly in /var/lib/exim4/config.autogenerated
Instead of using generated configuration, you can copy paste the configuration file from /usr/hare’/’doc/exim4-base in /etc/exim4, or use the generated one.
More over the /etc/init.d/exim4 load additional setting that control the option used to launch xim4 that’ ‘are as important as the configuration file.
So you should have a look to /etc/default/exim4, there you can find the queue start frequency for’ instance.