Re: [Asrg] where the message originated (was: DKIM role?) (SM)

[der Mouse <mouse at Rodents-Montreal.ORG>]

>> They aren't responsible to sign up for Clever-Idea-Of-The-Week and
>> implement whatever makes your life easier.
> But, primarily it make the domain owner's life easier.  In two ways.
> First, they will get less collateral spam into their mailboxes.
> Second, they will find that their email becomes more deliverable.

Will they?  Where are the numbers?

I suspect both may actually be false, given how spammers adopted SPF
with greater eagerness than other senders.  A practical statistician
without an axe to grind over SPF would see a positive correlation
between SPF presence and spamminess, causing senders with SPF to see
lower deliverability.  Less collateral spam is less clear, depending on
what counts as "collateral" spam, but I suspect the lower
deliverability from recipients who've noticed that SPF indicates higher
spaminess would outweigh the benefit from recipients who are using SPF
the way you seem to want it to be used.  (I suspect both effects are so
far down in the noise that it would require a huge sample size to tease
out which way the effects actually go.  If anyone has real measurements
either way, I'd love to see them.)

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