From: "Kevin P. Fleming" <kpfleming@cox.net>
To: Matt Bernstein <matt@theBachChoir.org.uk>
Cc: Matti Aarnio <matti.aarnio@zmailer.org>, linux-kernel@vger.kernel.org
Subject: Re: [ot] Re: Stupid anti-spam testings...
Date: Mon, 02 Sep 2002 19:53:58 -0700 [thread overview]
Message-ID: <3D742446.1070403@cox.net> (raw)
In-Reply-To: Pine.LNX.4.44.0209030044210.12780-100000@jester.mews
Matt Bernstein wrote:
>
> Anyway I think this kind of paranoia is just silly. It's trivial to forge
> a valid sender address, so why bother checking anything other than a
> syntactically valid domain name?
>
Because, believe it or not, most spammers don't bother. The main server
that I maintain (_NOT_ where I receive L-K) drops at least 20 messages a
day at RCPT TO: time using this very check. Considering that's 50% of
the spam we drop at RCPT TO: time, I'd say it's worth it.
But I do agree, the systems doing the callouts should cache the results
(I'm an Exim 4.10 user as well).
next prev parent reply other threads:[~2002-09-03 2:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-02 21:50 Stupid anti-spam testings Matti Aarnio
2002-09-02 22:28 ` Andreas Dilger
2002-09-02 23:32 ` Matti Aarnio
2002-09-02 23:48 ` Davide Libenzi
2002-09-02 23:55 ` [ot] " Matt Bernstein
2002-09-03 2:53 ` Kevin P. Fleming [this message]
2002-09-03 2:27 ` Barry K. Nathan
2002-09-04 12:30 ` Henning P. Schmiedehausen
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