[143132] in North American Network Operators' Group
Re: [BULK] Re: SORBS contact
daemon@ATHENA.MIT.EDU (William Herrin)
Sat Jul 30 09:47:16 2011
In-Reply-To: <5216.1311952950@turing-police.cc.vt.edu>
From: William Herrin <bill@herrin.us>
Date: Sat, 30 Jul 2011 09:46:13 -0400
To: Valdis.Kletnieks@vt.edu, Michelle Sullivan <matthew@sorbs.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Fri, Jul 29, 2011 at 11:22 AM, <Valdis.Kletnieks@vt.edu> wrote:
> On Fri, 29 Jul 2011 09:48:44 EDT, William Herrin said:
>> Correction: It's a standard way to denote that "this mail is a bounce
>> report."
>
> It's *not* just "bounce reports" (in particular, DSNs and MDNs are not
> non-delivery (bounce) messages in the sense of section 3.7, and both
> can be generated in response to *successful* deliveries).
> generated for *successful* deliveries).
Hi Vladis,
Point taken. Bounce reports, temporary failure reports and successful
delivery reports. Nevertheless, it still isn't for "other
programmatically generated mail." In fact, the next paragraph in RFC
5321 4.5.5 says:
"All other types of messages (i.e., any message which is not required
by a Standards-Track RFC to have a null reverse-path) SHOULD be sent
with a valid, non-null reverse-path."
Contrary to your claim, it's perfectly reasonable for an spam filter
in a symmetric routing scenario to discard a null return path message
that isn't unambiguously responsive to one it previously sent.
On Fri, Jul 29, 2011 at 5:52 PM, Michelle Sullivan <matthew@sorbs.net> wrot=
e:
> Umm no... As has been pointed out by others, but in another section
> (maybe another RFC) it says that the null return path should be used
> when a return message is not required, not desired, or it is from an
> automated system or you wish to avoid mail loops (with particular
> reference to bounce messages and mailing lists.)
Michelle,
Is your web site registration message required by a standards track
RFC to use a null reverse path?
Regards,
Bill Herrin
--=20
William D. Herrin ................ herrin@dirtside.com=A0 bill@herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004
