On Thu, Oct 09, 2003 at 04:50:26AM -0700, Mr. Ned wrote:
| Hi, I've written a draft proposal against spam, and one of the people who
read it referred me to SMTP+SPF. I've read the information about SPF, and here
is my reaction:
|
| Because sender verification is performed by checking the IP address from
which the mail was sent, there's a problem whenever a user is travelling, or
uses dial-up and doesn't know what his/her address is going to be. I haven't
seen any solution to this problem in any of the pages, or in the FAQ, is there?
I tried to address this problem at http://spf.pobox.com/objections.html
under "The Traveling Mailman Problem".
"the IP address from which the mail was sent" is not a specific
concept. SPF only operates within the context of a single SMTP
transaction, testing the TCP client IP. if you are travelling, but can
connect to your home SMTP server, there is no problem.
Are you familiar with SASL AUTH?
A cookie-style proposal such as you suggest has been recently posted to
the SPF list.
see
http://archives.listbox.com/spf-discuss(_at_)v2(_dot_)listbox(_dot_)com/200310/0049.html
http://archives.listbox.com/spf-discuss(_at_)v2(_dot_)listbox(_dot_)com/200309/0017.html
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