SPF HELO is a very low cost check, but does not match as often as Mail From
(not everyone has published SPF records for HELO, but they should). HELO
checks are a VERY reliable way to reject messages. It is unlikely to produce
false positives.
Additionally, what will you check if you get mail from <>?
It is not clear on the web site, or in "common parlance" that
SPF is designed for, or to be used for, HELO. I am looking into
using it on HELO, and am getting pushback from admins that this
is an abuse of SPF, and not "supported".
Is there a definitive statement I can point to that declares that this
usage is OK?
Corollary: is there instruction in the SPF setup "wizards" that gives
guidance to admins to make sure that SPF records support HELO
checking?
-dgl-
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