const char **hdrlist
Select header fields to be signed for this message, overriding the library
||dkim_signhdrs() can be called after a signing handle is created
||A message signing handle.
||A NULL-terminated array of strings containing the names of header
fields to be included in the hashes that generate this signature.
- This overides the list of header field names previously selected as the
library default by a call to
dkim_options(). It affects only the
handle passed to the function. If not called, the default set configured for
this library instance is used.