Following several tutorials on how to configure exim4 (e.g. http://www.datadisk.org.uk/html_docs/exim/routers.htm) I started wondering what a good explanation for !+local_domains in the specification of routers could be, e.g.

   driver = manualroute
   transport = remote_smtp
   route_list = !+local_domains smarthost.example.com

What is the consequence of omitting it?


In exim configuration domainlist local_domains is used to store list of email domains that should be delivered to local (this hosts) mailboxes. Without route_list = !+local_domains smarthost.example.com even messages to root@localhost would be relayed to smarthost.

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