Lists and Maps
Lists are used to store groups of domains, addresses or other unique identifiers referenced by particular policy rules. For example, in the default PureMessage policy, the first rule checks the message relay against the relays configured in the Internal Hosts list.
Address maps are used to associate one email address with another, either for the purpose of redirecting notifications generated by PureMessage (such as emailed digests of quarantined mail), or for the purpose of assigning one user's email preferences to other accounts (for End User Web Interface usage).
Note: Lists and address maps with more than 5,000 entries should be converted into CDB format for better performance. See "CDB Lists and Maps" in the Policy Configuration section of the Administrator's Reference for instructions on editing lists.conf and converting the files with pmx-makemap.