nanog mailing list archives

Re: ISP phishing


From: Tony Finch <dot () dotat at>
Date: Wed, 29 Jun 2005 10:58:16 +0100


On Wed, 29 Jun 2005, Brad Knowles wrote:

      SPF is not a panacea.

      In fact, it is pretty much totally worthless, unless you are the sole
owner of a given domain and you can guarantee that all mail you ever send will
always be routed through the machines that you own and control, and you know
that you don't ever forward e-mail for any of your other accounts.

Actually, what you have to guarantee is that you never send email to
anyone who forwards their email elsewhere. This is impossible.

Tony.
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