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Exim: The Mail Transfer Agent by Philip Hazel

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Chapter 6. Options Common to Directors and Routers

Previous chapters introduced a number of general options that can be set for any director or router to show how some common configuration requirements could be met. This chapter recaps those options, and also includes the remaining options that are common to all directors and routers. These are usually called generic options. In addition, each director and router has some options that are specific to its operation; these are described in the following chapters in the sections on the individual drivers.

One generic option that is always set is driver. This determines which particular director or router is to be used. When a driver decides to accept an address and queue it for a transport, the value of the generic transport option is expanded, and must yield the name of an available transport. If it does not, delivery is deferred.

The remaining generic options can be divided into four types:

  • Those that set conditions for the running of the driver

  • Those that change what happens when a driver is successful; that is, when it accepts an address

  • Those that add data to an address accepted by the driver, for use when that address is delivered

  • Those that provide debugging information

The options for any driver may be given in any order in the configuration file, except that those specific to the individual driver must follow the setting of driver. For this reason, driver is normally given first.

Conditional Running of Routers and Directors ...

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