Rob Maidment:
> If I configure canonical_classes to include header_sender and
> header_recipient, which headers are included exactly?  Can this be
> configured?

Header properties (including header formats) are not (yet) configurable.
The properties are defined in a table in global/header_opts.c, where
the HEADER_OPT_RECIP and HEADER_OPT_SENDER flags determine which
header will be rewritten as a sender or recipient.

        Wietse

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