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Postfix Documentation
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Postfix lists versus tables

Most Postfix lookup tables are used to look up information. Examples are address rewriting (the lookup string is the old address, and the result is the new address) or access control (the lookup string is the client, sender or recipient, and the result is an action such as "reject").

With some tables, however, Postfix needs to know only if the lookup key exists. The lookup result itself is not used. Examples are the local_recipient_maps that determine what local recipients Postfix accepts in mail from the network, the mydestination parameter that specifies what domains Postfix delivers locally, or the mynetworks parameter that specifies the IP addresses of trusted clients or client networks. Technically, these are lists, not tables. Despite the difference, Postfix lists are described here because they use the same underlying infrastructure as Postfix lookup tables.

Postfix Documentation
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