Exim

Basic MTA (Mail Transfer Agent)

The configuration can be modified in /etc/exim4/. These lines need to be modified:

dc_eximconfig_configtype='satellite'
dc_other_hostnames='<your hostname>'
dc_readhost='<your domainname>'
dc_smarthost='<your mailserver>'
dc_hide_mailname='true'

Then run update-exim4.conf then the final config will be put in /etc/exim4/conf.d