I'll add the following text to release notes:
An associative array %signed_header_fields controls which header fields
are to be signed. By default it contains a standard (RFC 4871) set of
header field names, augmented by some additional header field names
considered appropriate at the time of a release (RFC 4021, RFC 3834).
In addition a 'Sender' header field is excluded because it is frequently
replaced by a mailing list, and as the RFC 2821 mandates there can only
be one such header field the original one is dropped, invalidating a
signature. Also the 'To' and 'Cc' are excluded from a default set because
sendmail mailers are known to gratuitously reformat the list, invalidating
a signature.
The default set of header fields to be signed can be controlled
by setting %signed_header_fields elements to true (to sign) or
to false (not to sign). Keys must be in lowercase, e.g.:
$signed_header_fields{'received'} = 0; # turn off signing of Received
$signed_header_fields{'to'} = 1; # turn on signing of To
Mark
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