So this would only catch emails where the spammer used a valid domain in
the HELO/EHLO command and that domain has published spf records correct?
Bogus domains would still "pass" the SPF testing because there would be
nothing to look up, right? Isn't this (most likely) going to be a very,
very small percentage (if ever)? I guess every little bit can help.
Please respond to spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
cc: (bcc: Dan Mitton/YD/RWDOE)
Subject: [spf-discuss] Re: libspf2 sample programs
LSN: Not Relevant
User Filed as: Not a Record
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Julian Mehnle wrote:
I'm sure there's an RFC implying that greylisting or tar-pitting is
forbidden, too. But since there is no protocol police, we do what's
best for security. If that means rejecting dubious HELO identities and
ignoring the relevant parts of RFCs 1123 and 2821 in the process, so be
it. You are of course free to honor the RFCs and never reject on a bad
HELO.
Oh, and of course, in the case of SPF, it is always the domain owner
(here:
of the HELO domain) who has opted in to the stricter requirements of SPF
(RFC 4408) by publishing an SPF record for the domain, so if you reject on
a HELO domain that fails an SPF check, you can be confident that it is
with the consent of the domain owner.
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