Thanks Wietse.  So the list is (in 3.1.1):

HDR_OPT_SENDER:
Disposition-Notification-To
Errors-To
From
Mail-Followup-To
Reply-To
Resent-From
Resent-Sender
Return-Path
Return-Receipt-To
Sender

HEADER_OPT_XRECIP:
Bcc
Cc
Resent-Bcc
Resent-Cc
Resent-To
To


On 2 June 2016 at 14:08, Wietse Venema <wie...@porcupine.org> wrote:
> 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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