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Chapter 18. Domain, Host, and Address Lists > Host Lists
18.5. Host Lists
Host lists are used to control what remote hosts are allowed to do (for example, use the local host as a relay).
18.5.1. Host Checks by IP Address
When Exim receives an SMTP call from another host, the only reliable identification it initially has for the host is its IP address. This address is used for checking when any of these items is encountered in a host list:
