This is a base Exim docker image configured to act as a relay with some basic
main, acl and retry defaults.
No routers, transports or authenticators are configured, so by default it will
fail delivering all mail.
You can use it as a base for your docker images. Put your configuration
either to /etc/exim/exim.conf or to the following included files:
/etc/exim/conf.d/main.conf/etc/exim/conf.d/acl.conf/etc/exim/conf.d/routers.conf/etc/exim/conf.d/transports.conf/etc/exim/conf.d/retry.conf/etc/exim/conf.d/rewrite.conf/etc/exim/conf.d/authenticators.conf/etc/exim/conf.d/local_scan.conf
Sets relay_from_hosts host list which is used in acl checks.
Default value: 10.0.0.0/8 : 172.16.0.0/12 : 192.168.0.0/16