/etc/hostmane: containe ip of host /etc/mailname: contains host part of sender adress /etc/exim4/update-exim4-conf.conf: dc_eximconfig_configtype=’internet’ dc_other_hostnames=’46.x.y.z’ dc_local_interfaces=’46.x.y.z; 127.0.0.1 ; ::1′ dc_readhost=” dc_relay_domains=” dc_minimaldns=’false’ dc_relay_nets=” dc_smarthost=” CFILEMODE=’644′ dc_use_split_config=’false’ dc_hide_mailname=” dc_mailname_in_oh=’true’ dc_localdelivery=’maildir_home’ test: mail -s hello xy@zzz.ch