Hi KJ, depending on which configuration scheme is used for exim4 (splitted config or not) the file to be changed is different. So either edit both locations (/etc/exim4/exim4.conf.template and a file in /etc/exim4/conf.d) or make sure which scheme is used. To find out command
grep -A2 'exim4/use_split_config' /var/cache/debconf/config.dat and see what the line beginning with "Value:" says. After configuration changes don't forget to execute "update-exim4.conf" as root. The default configuration has tls_advertise_hosts = MAIN_TLS_ADVERTISE_HOSTS and MAIN_TLS_ADVERTISE_HOSTS = * See /etc/exim4/exim4.conf.template and /etc/exim4/conf.d/main/03_exim4-config_tlsoptions. Maybe there are local modifications in your configuration files. Then the update should've stored new config files with ".dpkg-dist" or something added to their normal names. Regards, jvp.