Dear subscribers, I installed exim4 on Debian 6 and used dpkg-reconfigure to choose the configuration "internet site; mail is send and received directly usind SMTP". Although my server has the hostname mydomain.com, it is not the primary mail server for @mydomain.com. Unfortunately my server acts as the final destination for @mydomain.com. Thus sending an email to something at mydomain.com, where something is not a user on my server, will not work because of an unrouteable address. Instead my mail server should look for the mx entries via DNS. 2011-10-13 13:36:57 1REJar-00035V-7z <= root at mydomain.comU=root P=local S=331 2011-10-13 13:36:57 1REJar-00035V-7z ** something at mydomain.com: Unrouteable address 2011-10-13 13:36:57 1REJar-00035V-7z Completed Help is much appreciated. /etc/exim4/update-exim4.conf.conf: dc_eximconfig_configtype=''internet'' dc_other_hostnames=''localhost'' dc_local_interfaces=''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=''mail_spool'' /etc/mailname: mydomain.com /etc/hostname: mydomain.com