Richard,
> Sometimes the arriving messages from our ISP have multiple X-Spam-Flag
> lines from multiple MTA's it has been rerouted through. [...]
> I have looked at the sub get_header_field.
> If i want to select the first X-Spam-Flag. (top one - last MTA)
> I use : get_header_field_body('X-Spam-Flag',0)
Yes, the get_header_field_body('X-Spam-Flag',0) would provide
the topmost header field X-Spam-Flag.
> But what if I don't specify the : '0'
> If i understand the sub get_header_field, it uses default the 0 ?
No, if the index is not specified it defaults to undef, which for
this subroutine is made equivalent to -1, i.e. the most bottom
header field. I chose this default because it is consistent
with how DKIM verification algorithm searches for header
fields: bottom-up.
> So default it uses the first X-Spam-Flag line it finds from the top to
> bottom ? Am i correct ?
Explicitly specify a 0 if you want the topmost header field.
Mark
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