Processnestedmessages, retainnestedmessages Channel Options

Processing within nested messages
New in 8.0.2.3. The   and   channel options control the handling of nested messages, (that is, message/rfc822 and message/global parts), by the MTA&#x27;s message structure parsing code. They are particularly relevant for the conversion channel, as they control whether the conversion channel processes "inside" such parts. is the default: nested messages are treated as just another level in the MIME structure and all the enclosed parts are processed. With, the conversion channel treats nested messages as monolithic and does not "look inside".

The  channel option is intended to be used when it is necessary to operate on encapsulated messages in their entirety.

See also:
 * Conversion channel
 * Attachments and MIME processing channel options
 * Channel options