[95403] in North American Network Operators' Group
Re: Possibly OT, definately humor. rDNS is to policy set by federal
daemon@ATHENA.MIT.EDU (Tony Finch)
Sat Mar 17 10:12:40 2007
Date: Sat, 17 Mar 2007 14:09:42 +0000
From: Tony Finch <dot@dotat.at>
To: Rich Kulawiec <rsk@gsp.org>
Cc: nanog@merit.edu
In-Reply-To: <20070317140042.GA5306@gsp.org>
Errors-To: owner-nanog@merit.edu
On Sat, 17 Mar 2007, Rich Kulawiec wrote:
> On Sat, Mar 17, 2007 at 01:09:47PM +0000, Peter Corlett wrote:
> > Would you care to expand on why you think sender callback
> > verification is apparently abusive and supports spam?
>
> (a) this is wandering off-topic and (b) this has been covered in great
> depth on Spam-L multiple times, so I'll refer you there for more
> substantive discussion; consider this merely a brief overview whose
> points are not particularly well-ordered, although I'm going to try
> to list them from abstract-to-applied.
You failed to mention that callbacks encourage spammers to use real email
addresses instead of bogus inventions, thus making the backscatter
problem worse. Also, a non-working sender address is not well correlated
with spam: there are lots of legitimate but broken senders, such as mail
servers which reject MAIL FROM:<> and web servers which send MAIL
FROM:<wwwdata@webserver> and don't have an SMTP listener.
Tony.
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