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Host Lists

Host lists are used to control what remote hosts are allowed to do (for example, use the local host as a relay).

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:

  • If the entire item is *, it matches any IP address, and therefore any host. For example:

    sender_verify_hosts = *

    specifies that, if sender_verify is turned on, it will apply to all hosts.

  • If the item is an IP address, it is compared with the IP address of the subject host. For example:

    host_accept_relay = 10.8.43.23

  

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