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Re: RE: [Asrg] Some data on the validity of MAIL FROM addresses

"Jon Kyme" <jrk@merseymail.com> Tue, 20 May 2003 19:54 UTC

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In-Reply-To: <p06001309baf01ddc480e@[192.168.1.104]>
Subject: Re: RE: [Asrg] Some data on the validity of MAIL FROM addresses
To: Kee Hinckley <nazgul@somewhere.com>
From: Jon Kyme <jrk@merseymail.com>
Cc: ASRG <asrg@ietf.org>
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Date: Tue, 20 May 2003 20:46:58 +0100

Kee mailed me off-list and correctly pointed out that much of what I was
saying wasn't really relevant.

But part of his response is on topic so I've taken the liberty of bringing
it back to the list.

> >on the specific issue (response to RCPT TO <non-existent-rcpt>) we were
> >discussing. It's clear that some operators can do this on very large
> >distributed systems. Others can't - or won't.
> 
> It could well be a "won't".  By deferring the reject until after the 
> DATA command you make it very difficult to probe for valid addresses 
> to spam.

No, you don't make it difficult for spammers. They will send some data.
You only make it difficult for people attempting to verify addresses
without sending data; so-called "SMTP callback" for instance, or when
trying to verify a list of addresses for research purposes :-)







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