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Re: [Asrg] Please critique my anti-spam system

On Jan 8, 2005, at 13:40, Peter J. Holzer wrote:
On 2005-01-08 12:36:23 -0500, Seth Breidbart wrote: 
Ken Raeburn <raeburn at raeburn.org> wrote:

Will that work in a world that still has a lot of mailing lists that
don't rewrite the envelope sender data, such that bounces go back to
the sender but from addresses the sender didn't send to?


That one I don't consider a problem; if you subscribe to a mailing
list and I post to the list, I _don't_ want to see anything automatic
 from you.


I think he means it the other way around: Every time you post
something to a mailinglist, you get a lot of challenges because your
address isn't in the whitelist.

I meant both, actually. :-)
More to the point, I wanted to know what Michael Kaplan thought about the various situations:

1) Sender isn't filtering bounces but multiple list members are using his system and thus issue challenges.

2) Sender is filtering bounces (either approach that's been discussed -- discard all bounces generated by this system because you object to it, or look for recognized addresses as the bounce sender), and multiple list members are using his system

3) Sender is filtering bounces, and the original recipient address is a simple mail forwarding service, with the final destination running his system

I've deleted the email with the URL, and it's out of my browser's history now, but I don't recall the proposal addressing these points from my earlier reading.

I'd be kind of disappointed if his answer turns out to be the same as for SPF (i.e., don't forward without rewriting the envelope), but offhand I don't see what else would work without losing a lot of mail, which I would consider unacceptable.


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