Rules, norules Channel Options

Channel-specific rewrite rules ( ,
The  channel option tells the MTA to  enforce channel-specific rewrite rule checks, and can be placed on source channels and on destination channels. When placed on a source channel,  allows  source channel-specific effects from   or   control sequences in a rewrite rule template to take effect when that source channel is enqueueing a message and rewriting  addresses. When placed on a destination channel,  allows destination channel-specific effects from   or   control sequences in a rewrite rule template to take effect for addresses in messages being enqueued to that destination channel. is the default. tells the MTA not to check. These two channel options are usually used for debugging and are rarely used in actual applications.

See also:
 * Source channel-specific rewrites
 * Destination channel-specific rewrites
 * Headers channel options
 * Addresses channel options
 * Channel options