On Fri, 19 Mar 2004, John Reilly wrote:
> SPF is a method for reducing the amount of spam that can forge your address
> undetected. SPF just specifies the permitted sending IP addresses for a
> particular domain. I doubt if SPF checking on the linux.ie MX servers would
> reduce the spam by much without more widespread publishing of SPF RRs.
Still wouldn't hurt to do it. If people don't start it will never catch on
and it will be a very handy tool against spam when it's more widespread.
> There could be issues around publishing SPF RRs for linux.ie itself given the
> fact that there are a number of people on the list with linux.ie addresses
> that probably use their local SMTP server (whereever it may be) to send their
> linux.ie mails.
To the best of my knowledge, at the moment it will only drop/mark mails if
it tries the SPF and the ip sending the email isn't permitted. If
the domain has no published SPF it lets the email through as normal. This
is the main reason why AOL and other ISPs are so interested in it.
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