nanog mailing list archives
Re: Barracuda Networks Spam Firewall
From: Valdis.Kletnieks () vt edu
Date: Tue, 18 May 2004 16:57:56 -0400
On Tue, 18 May 2004 16:13:20 EDT, Todd Vierling said:
On Tue, 18 May 2004 Valdis.Kletnieks () vt edu wrote: : Yes, it *would* be nice if everybody in the world was able to DTRT on : their outward-facing gateway and send back an immediate 550 on a RCPT TO: : in order to stop stuff right up front. However, this implies getting : buy-in and resources of all the appropriate people. Blocking outbound mail from such entities is a pretty good way to get buy-in. (Yes, there's a DNSBL in work to enumerate such systems.)
When it gets built, will it list AOL.COM for not rejecting at the original RCPT TO? Or Hotmail.com? (Consider the following 2 pieces of mail - mail comes in from someplace with a From: @aol.com, our Listserv tries to process the command (which was actually spam, but it's hard to tell that until you try to handle it), and send the response back... notice that AOL didn't 550 my mail, but accepted and bounced it. Similarly for the hotmail.com mail - the spam comes in, and they accept-and-bounce our response rather than 550 it (although to be fair, they usually DO manage to 550 this stuff). Yes, it's generally a good idea - but not one that everybody can carry out all the time. You don't like it, take it up with the AOL and Hotmail guys, not me, OK? :)
--- Begin Message --- From: Mail Delivery Subsystem <MAILER-DAEMON () aol com>
Date: Mon, 17 May 2004 04:56:58 -0400 (EDT)
The original message was received at Mon, 17 May 2004 04:56:55 -0400 (EDT) from listserv.vt.edu [198.82.161.192] *** ATTENTION *** Your e-mail is being returned to you because there was a problem with its delivery. The address which was undeliverable is listed in the section labeled: "----- The following addresses had permanent fatal errors -----". The reason your mail is being returned to you is listed in the section labeled: "----- Transcript of Session Follows -----". The line beginning with "<<<" describes the specific reason your e-mail could not be delivered. The next line contains a second error message which is a general translation for other e-mail servers. Please direct further questions regarding this message to your e-mail administrator. --AOL Postmaster ----- The following addresses had permanent fatal errors ----- <ssamantra () aol com> ----- Transcript of session follows ----- ... while talking to air-xg01.mail.aol.com.:RCPT To:<ssamantra () aol com><<< 550 MAILBOX NOT FOUND 550 <ssamantra () aol com>... User unknownReporting-MTA: dns; rly-xg05.mx.aol.com Arrival-Date: Mon, 17 May 2004 04:56:55 -0400 (EDT) Final-Recipient: RFC822; ssamantra@aol.com Action: failed Status: 5.1.1 Remote-MTA: DNS; air-xg01.mail.aol.com Diagnostic-Code: SMTP; 550 MAILBOX NOT FOUND Last-Attempt-Date: Mon, 17 May 2004 04:56:58 -0400 (EDT)Received: from listserv.vt.edu (listserv.vt.edu [198.82.161.192]) by rly-xg05.mx.aol.com (v99_r4.3) with ESMTP id MAILRELAYINXG56-47040a87e5628e; Mon, 17 May 2004 04:56:54 -0400 Received: from listserv.vt.edu (LOCALHOST [127.0.0.1]) by listserv.vt.edu (8.12.10/8.12.10/LISTSERV) with ESMTP id i4H85h43139864 for <ssamantra () AOL COM>; Mon, 17 May 2004 04:56:54 -0400 Date: Mon, 17 May 2004 04:56:54 -0400 From: "L-Soft list server at LISTSERV.VT.EDU (1.8e)" <LISTSERV () listserv vt edu> Subject: Re: start making money To: ssamantra () AOL COM Message-ID: <LISTSERV%2004051704565448 () LISTSERV VT EDU> X-AOL-IP: 198.82.161.192 X-AOL-SCOLL-SCORE: 0:XXX:XX X-AOL-SCOLL-URL_COUNT: 0
--- End Message ---
--- Begin Message --- From: postmaster () mail hotmail com
Date: Sun, 11 Apr 2004 22:07:51 -0700
This is an automatically generated Delivery Status Notification. Delivery to the following recipients failed. wxnjbs818378 () HOTMAIL COMReporting-MTA: dns;mc2-f24.hotmail.com Received-From-MTA: dns;listserv.vt.edu Arrival-Date: Sun, 11 Apr 2004 22:07:13 -0700 Original-Recipient: Final-Recipient: rfc822;wxnjbs818378@HOTMAIL.COM Action: failed Status: 5.0.0 Diagnostic-Code: smtp;550 Requested action not taken: mailbox unavailable--- Begin Message --- From: "L-Soft list server at LISTSERV.VT.EDU (1.8e)" <LISTSERV () listserv vt edu>
Date: Mon, 12 Apr 2004 01:07:11 -0400
Your message dated Sun, 11 Apr 04 23:05:06 GMT with subject "Á÷ÀåÀηР½ÅûÇϼ¼¿ä 6°³¿ùÀÌ»ó±Ù¹«ÀÚ clrqy lhu iotgnuhca" has been submitted to the moderator of the TURBVIS list: compt-gate () SOLARIS CC VT EDU.
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Current thread:
- Re: Barracuda Networks Spam Firewall, (continued)
- Re: Barracuda Networks Spam Firewall Valdis . Kletnieks (May 18)
- Re: Barracuda Networks Spam Firewall Christopher X. Candreva (May 18)
- Re: Barracuda Networks Spam Firewall Valdis . Kletnieks (May 18)
- Re: Barracuda Networks Spam Firewall Todd Vierling (May 18)
- Re: Barracuda Networks Spam Firewall Todd Vierling (May 18)
- backscatter hosts (was: Re: Barracuda Networks Spam Firewall) Steven Champeon (May 18)
- Re: Barracuda Networks Spam Firewall Christopher X. Candreva (May 18)
- Re: Barracuda Networks Spam Firewall Valdis . Kletnieks (May 18)
- Re: Barracuda Networks Spam Firewall Todd Vierling (May 18)
- Re: Barracuda Networks Spam Firewall Valdis . Kletnieks (May 18)
- Re: Barracuda Networks Spam Firewall Christopher X. Candreva (May 18)
- Re: Barracuda Networks Spam Firewall Valdis . Kletnieks (May 18)
- Re: Barracuda Networks Spam Firewall Todd Vierling (May 18)
- Re: Barracuda Networks Spam Firewall Eric A. Hall (May 18)
- Re: Barracuda Networks Spam Firewall Per Gregers Bilse (May 18)
- Re: Barracuda Networks Spam Firewall Eric A. Hall (May 18)
- Re: Barracuda Networks Spam Firewall Per Gregers Bilse (May 18)