These days, I was confused by exim4 behavior on debian:
# hostname gurke2 # cat /etc/hostname gurke2 # exim -bt herbert@gurke2 R: nonlocal for herbert@gurke2 herbert@gurke2 is undeliverable: Mailing to remote domains not supported
So, although the recipient herbert@gurke2 clearly should be treated as a recipient in the local domain (the local host is named gurke2), exim thinks that gurke2 is a remote domain.
After digging into the config files, I came across the options named local_domain and MAIN_LOCAL_DOMAINS, searched the web for these and found the solution in this thread. The dc_other_hostnames is the right place to add host names (or fully qualified domain names) that should be treated by exim’s local_user router. I set this to gurke2, reloaded the exim configuration, and tested again. It works:
# vi /etc/exim4/update-exim4.conf.conf # cat /etc/exim4/update-exim4.conf.conf | grep dc_other_hostnames dc_other_hostnames='gurke2' # service exim4 reload [ ok ] Reloading exim4 configuration files: exim4. # exim -bt herbert@gurke2 R: system_aliases for herbert@gurke2 R: userforward for herbert@gurke2 R: procmail for herbert@gurke2 R: maildrop for herbert@gurke2 R: lowuid_aliases for herbert@gurke2 (UID 1000) R: local_user for herbert@gurke2 herbert@gurke2 router = local_user, transport = mail_spool
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