How does the new anti spam SPF work regarding the senders email address ?

Discussion in 'Computer Security' started by Frank Callone, Oct 16, 2004.

  1. SPF (Sender permitted from) seems to be the neew next anti spam technology.
    But how does it treat the senders email address in the "from" header field of a mail?

    Is it allowed to change the from field after introduction of SPF?
    Or is only the senders IP address unchangeable ?

    The problem is that on my computer there are a couple of people occasionally working
    (and sending email to our only provider).
    From this internet provider we got 1 email address (and one email account on the his server).

    Currently we can change the sender email address from user to user e.g.




    Is this possible with SPF or do we really have to buy an extra upgrade to a multi account package?

    Frank
     
    Frank Callone, Oct 16, 2004
    #1
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  2. Frank Callone

    Sam Guest

    Re: How does the new anti spam SPF work regarding the senders emailaddress ?

    Frank Callone writes:

    > SPF (Sender permitted from) seems to be the neew next anti spam technology.
    > But how does it treat the senders email address in the "from" header field of a mail?
    >
    > Is it allowed to change the from field after introduction of SPF?
    > Or is only the senders IP address unchangeable ?


    SPF defines how to determine what a domain thinks about the relationship
    between a particular IP address, and an E-mail address in the domain in
    question. All SPF implementations use this to determine whether to accept
    an E-mail message originating at a particular IP address, and carrying a
    particular envelope return address.

    However, there's no technical barrier to substituting the envelope return
    address with the address in the From: header; and checking that relationship
    in addition to, or instead of, the traditional check that uses the envelope
    return address. If an individual site chooses to do something like that,
    it's certainly their privilege to operate their mail servers in whatever
    way they see fit. And, I'm sure that quite a few organizations configure
    their mail servers to do just that.

    Earlier this year Microsoft proposed a validation scheme for the From:
    header, that's based on SPF. Microsoft submitted their proposal to the IETF
    MARID working group for standardization purposes; however Microsoft
    also announced patent claims on their "Sender ID" proposal. Because
    Microsoft was unwilling to use patent licensing terms that were acceptable
    to the open source community, Microsoft's Sender ID proposal was ultimately
    rejected.

    > The problem is that on my computer there are a couple of people occasionally working
    > (and sending email to our only provider).
    > From this internet provider we got 1 email address (and one email account on the his server).
    >
    > Currently we can change the sender email address from user to user e.g.
    >
    >
    >
    >
    > Is this possible with SPF or do we really have to buy an extra upgrade to a multi account package?


    None of that has any relevance to SPF.


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    Sam, Oct 16, 2004
    #2
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  3. SPF is harmful. Adopt it.

    FC> SPF (Sender permitted from) seems to be the neew next anti spam
    FC> technology.

    You're about 15 months behind. SPF isn't new any more, and gradually
    people are coming to the same realisation that those well-versed in the
    field came to last year, namely that (despite the marketing hyperbole
    plastered all over its web site) it doesn't really deal with UBM at all.

    <URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/smtp-spf-is-harmful.html>

    FC> But how does it treat the senders email address in the "from" header
    FC> field of a mail?

    You're about 12 months behind on that one. (Hint: There's been a
    kerfuffle about patents on that particular subject.)
     
    Jonathan de Boyne Pollard, Oct 18, 2004
    #3
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