John Robinson wrote:
> 
> Err, "unsubscribed sender address"? Perhaps I misunderstood the earlier 
> poster's intention; I thought he just meant the auto-response to 
> non-members should include more/better instructions on how to subscribe 
> and a request not to resend, not a way of posting without membership.
> 
> I may still be being very dense, of course :-)

Yes, you still are. :) Sending _any_ auto-response is a bad thing, 
because the sender address of the spam (which is the vast majority of 
posts by unsubscribed addresses) is almost always forged, so that 
auto-response is backscatter.

- Marc

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