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    SubjectRe: VGER does gradual SPF activation (FAQ matter)
    Hmmm.
    What about using spamhaus.org sbl+xbl list?
    I used to receive 1200 spam messages a day, with spamhaus only half of
    that.

    On Sun, Jun 11, 2006 at 01:27:34AM +0300, Matti Aarnio wrote:
    > Now that there is even an RFC published about SPF...
    >
    >
    > What is SPF ?
    >
    > It is one way to to ensure that at SMTP transport level the claimed
    > message source domain is valid, and message is coming from place
    > where origination domain's administrator has declared that are valid
    > source servers for emails claiming to be of that domain.
    >
    >
    > It does NOT verify that SMTP origination local part is true.
    >
    > It does NOT verify message visible headers.
    >
    > Several people have written MTA configurations that test arriving email
    > visible "From:" (and sometimes "Sent:") header against SPF data and
    > actually violate SPF specification doing that!
    > (We have routinely kicked subscribers with that bug from lists..)
    >
    >
    > What it gives ?
    >
    > It gives us a way to tell the world, that emails claiming to be
    > coming from VGER should be accepted only when they really are
    > coming from vger. (Complications like recipients incoming MX
    > relays are not _our_ problem..)
    >
    > We might get slight reduction of back falling junk at vger with
    > that - reduction increases when people begin to deploy the SPF
    > verification more and more widely into their receiving email servers.
    > (And do it correctly...)
    >
    >
    >
    > Will VGER begin to verify SPF in incoming email ?
    >
    > Yes, sometime this summer.
    >
    >
    >
    > What will break ?
    >
    > You really should go and read SPF documents and guides and FAQs at:
    > http://spf.pobox.com/
    >
    > Very little will break, but one should really consider converting
    > their email sending methodology to one, which uses fewest possible
    > number of servers, publish that data in DNS, and always send all
    > emails thru those servers.
    >
    > In longer run the amount of irresponsible (incurable) network security
    > holes (known as Windows) shows no sign of becoming extinct at adsl -lines,
    > so there will be increased pressure to demand sender identification
    > (and verification) during email sending - viruses can't do that yet...
    > And when they learn, user with infection can be trivially identified
    > and contacted/blocked. At the same time I do find it most likely that
    > ADSL-lines (and modems) will no longer be allowed to send _anywhere_
    > over plain SMTP.
    >
    > In order to be able to send email, a "SUBMISSION" protocol does exist,
    > and is relatively easy to get working with for example the Thunderbird.
    > Better would be having a button "use submission service" in its account
    > setup.. (And similar in Outlook/O.Express...)
    >
    >
    > /Matti Aarnio -- one of postmaster at vger.kernel.org
    > -
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    Folkert van Heusden

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