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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3D742446.1070403@cox.net \
--to=kpfleming@cox.net \
--cc=linux-kernel@vger.kernel.org \
--cc=matt@theBachChoir.org.uk \
--cc=matti.aarnio@zmailer.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox