[exim] Received-SPF, :spf_received: -> :at_start_rfc: ?

Hi,

the exiscan spec was suggesting to use

warn message = :spf_received:$spf_received

"Exim introduced selectable header positions in Version 4.43.
One option allows you to add your header after all Received:
headers. For optimal SPF draft/RFC2822 compliance, exiscan-acl
adds one other option, called "spf-received". It adds your
header before the first header which is NOT Received: or
Resent-*:, seen from the top of the header stack."

:spf_received: seems to have gone in 4.50, but there is
:at_start_rfc:, which seems to add "immediately before any line that
is not a Received: or Resent-something: header."

This looks even correcter to me (skipping Resent-* headers as well).

So, is

warn message = :at_start_rfc:$spf_received

the new suggested method of adding Received-SPF?

Thanks!
--
Axel.Thimm at ATrpms.net