From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/61846 Path: news.gmane.org!not-for-mail From: Maciej Matysiak Newsgroups: gmane.discuss,gmane.emacs.gnus.general Subject: Re: User-Agent in spam reporting Date: Sat, 04 Feb 2006 16:59:53 +0100 Organization: =?iso-8859-2?Q?gnu=B6ni?= ludzie Message-ID: <87zml7qfly.fsf@blah.pl> References: <874q7gislv.fsf@dod.no> <87d5m03rro.fsf@dod.no> <874q7c3qpw.fsf@dod.no> <87d5lw7i2f.fsf@dod.no> <87zmoi7hg3.fsf@dod.no> <87wtjh947c.fsf@dod.no> <4n1wykxnd0.fsf@lifelogs.com> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1139071934 31748 80.91.229.2 (4 Feb 2006 16:52:14 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sat, 4 Feb 2006 16:52:14 +0000 (UTC) Cc: "Ding List" Original-X-From: gmane-discuss-admin@hawk.netfonds.no Sat Feb 04 17:52:10 2006 Return-path: Envelope-to: gd-gmane-discuss@m.gmane.org Original-Received: from hawk.netfonds.no ([80.91.224.246]) by ciao.gmane.org with esmtp (Exim 4.43) id 1F5Qdp-0006xR-AQ for gd-gmane-discuss@m.gmane.org; Sat, 04 Feb 2006 17:52:05 +0100 Original-Received: from localhost ([127.0.0.1] helo=hawk.netfonds.no) by hawk.netfonds.no with esmtp (Exim 3.35 #1 (Debian)) id 1F5Qdm-0004WR-00; Sat, 04 Feb 2006 17:52:02 +0100 Original-Received: from blah.pl ([72.21.52.20]) by hawk.netfonds.no with esmtp (Exim 3.35 #1 (Debian)) id 1F5QdW-0004WI-00 for ; Sat, 04 Feb 2006 17:51:46 +0100 Original-Received: (qmail 21158 invoked by uid 1000); 4 Feb 2006 16:51:44 -0000 Original-To: gmane-discuss@hawk.netfonds.no In-Reply-To: <4n1wykxnd0.fsf@lifelogs.com> (Ted Zlatanov's message of "3 Feb 2006 14:18:19 -0500") Openpgp: id=EF8421FD Mail-Copies-To: nobody Mail-Followup-To: gmane-discuss@hawk.netfonds.no, "Ding List" User-Agent: Gnus/5.110004 (No Gnus v0.4) XEmacs/21.4.17 (Jumbo Shrimp) Original-Sender: gmane-discuss-admin@hawk.netfonds.no Errors-To: gmane-discuss-admin@hawk.netfonds.no X-BeenThere: gmane-discuss@hawk.netfonds.no X-Mailman-Version: 2.0.11 Precedence: bulk List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: Xref: news.gmane.org gmane.discuss:9248 gmane.emacs.gnus.general:61846 Archived-At: On the 3rd of February 2006 at 20:18, "Ted Zlatanov" wrote: > What do you think about ROT13 of the sender's address? It's fast, > transparent, and obfuscates enough for any casual snoopers. IMHO that's not a good idea. Using ROT13 on e-mail address can result in another *working* address. Silly example: abc.se -(rot13)-> nop.fr , both domains exist abc.it -(rot13)-> nop.vg , both domains exist ad.pn -(rot13)-> nq.ca , both domains exist etc. Some domains, like .vg, have "catch-all" dns policy, so any mangled domain (in that case from ".it") can be used for e-mail pollution. Example: tiscali.it -(rot13)-> gvfpnyv.vg phoner@malachai:~$ dnsqr mx gvfpnyv.vg. 15 gvfpnyv.vg: 87 bytes, 1+2+0+0 records, response, noerror query: 15 gvfpnyv.vg answer: gvfpnyv.vg 10800 CNAME pjn.qsrch.net answer: pjn.qsrch.net 86295 MX 0 ix2-mail-gw.new.net A spammer can use such rot13-ed address and still bother valid domain and its e-mail server with junk, which would be delivered (in case of accidentaly valid local-part or catch-all policy) or rejected. just my 2 (euro)cents, m.m. -- use gnus, not guns!