On 11/15/2010 10:25 AM, David F. Skoll wrote:
On Mon, 15 Nov 2010 08:07:43 -1000
Alexandre Chapellon<alexandre.chapel...@mana.pf> wrote:
I use it just the same for the domains I have complete controm over.
Unfortunately, be aware that this setup maybe forbid your legitimate
emails to be forwarded by a foreign host:
Yes, this is a deficiency in SPF. It would be nice if everyone used
SRS, but it's impossible to enforce that. (DKIM got this right with
the "d=xxx" declaration in the DKIM signature header.)
We, like you, don't worry about broken forwarding. Very few
organizations check SPF, and the number of those organizations who
have Yahoo, etc. users forwarding to them is even smaller.
Regards,
David.
Except SRS is also a broken technology create to fix a broken technology.
SPF used to block returns a lot of false positives, it blocks 100% of
forwarded email.
Spammer can and do use SPF so it's not a good white list either.
I've found two uses for SPF (Up from 0)
If SPF is correct and the domain is in my white list then I'll pass it
as white.
If the SPF is wrong and there are several other sins like bad RDNS or
bad HELO then I might add some points. Bad SPF also allows me to detect
what servers are forwarding email to me.
Other than that - it just plain doesn't work.
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