Noinner, inner Channel Options

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Inner header rewriting (noinner, inner)

The MTA only interprets the contents of header lines when necessary. However, MIME messages can contain multiple sets of message headers as a result of the ability to imbed messages within messages (message/rfc822). The MTA normally only interprets and rewrites the outermost set of message headers. The MTA can optionally be told to apply header rewriting to inner headers within the message as well.

This behavior is controlled by the use of the noinner and inner channel options on destination channels. noinner tells the MTA there is no special need to rewrite inner message header lines (though inner message header line processing may be triggered by other MTA facilities). It is the default. inner, when placed on a destination channel, tells the MTA to parse messages and rewrite inner headers.

These options can be applied to any channel.