The second part of an IMTA configuration file contains the definitions for the channels, themselves. These definitions are collectively referred to as the "channel/host table." Each individual channel definition forms a "channel block," which defines the channels that IMTA can use and the names associated with each channel. Blocks are separated by single blank lines. Comments, but no blank lines, may appear inside a channel block. A channel block contains a list of keywords which define the configuration of a channel. These keywords are referred to as "channel keywords." See TABLE 3-8 for more information.
The following imta.cnf file fragment displays a sample channel block:
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channelname keyword1 keyword2
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The routing_system is an abstract label used to refer to this channel within the rewrite rules.
For detailed information about channel definitions and channel table keywords, refer to the section entitled, "Channel Keywords Table," and TABLE 3-8 within that section.