Package: installation-guide Version: 20170614 > 8.5.1. Default E-Mail Configuration >> [...] For this reason the packages exim4 and mutt will be installed by default (provided you did not unselect the “standard” task during the installation).
I have been told by several people, exim4 is no longer installed by default :-).
In Debian 9 and above, exim4-daemon-light has been downgraded from "Priority: standard" to "optional".
Thanks Alan