[143105] in North American Network Operators' Group
Re: [BULK] Re: SORBS contact
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Jul 29 02:46:55 2011
To: "Brian R. Watters" <brwatters@absfoc.com>
In-Reply-To: Your message of "Thu, 28 Jul 2011 14:16:23 PDT."
<1d95a7a9-8340-45e7-b803-03f1827326e1@brw-abs-office>
From: Valdis.Kletnieks@vt.edu
Date: Fri, 29 Jul 2011 02:46:09 -0400
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Thu, 28 Jul 2011 14:16:23 PDT, "Brian R. Watters" said:
> Thanks .. their attempts to reach us are blocked via our Barrcacuda's due to
> the fact that they are sending with a blank FROM: and as such Barracuda thinks
> its SPAM
Please clarify. Are they sending
MAIL FROM: (syntactically broken, they need to fix it)
or
MAIL FROM:<> totally valid, and if your Barracuda rejects it, it's *your* problem.
And you might want to fix it, since your users will never get a bounce notice
from any RFC-compliant mailer - even if they *wanted* to know that their mail
wasn't delivered. <> is the RFC-standard way to denote "this mail is a bounce
report or other programmatically generated mail, and if it bounces itself, do *not*
generate another bounce, as that may start a bounce loop".
See RFC5321, sections 3.6, 4.5.5, and 6.1.
(And all those of you anti-spam zealots who want to argue about RFC5321's
SHOULD/MUST pronouncements on the handling of <>, I'll point out that there's
*lots* of wiggle room for those of us with years of SMTP wrangling experience.
On the other hand, we're talking about a potentially misconfigured Barracuda
here, and if a site has a misconfigured Barracuda, urging RFC-compliant
behavior is the only sane choice... ;)
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