From: erik quanstrom <quanstro@coraid.com>
To: mteege@gmail.com, 9fans@cse.psu.edu
Subject: Re: [9fans] $smtp dns failure
Date: Tue, 16 Jan 2007 12:01:35 -0500 [thread overview]
Message-ID: <afcb163908214423c69212f9647e0cb0@coraid.com> (raw)
the behaviour is not correct. rfc 2821 (section 5) says
The lookup first attempts to locate an MX
record associated with the name. If a CNAME record is found instead,
the resulting name is processed as if it were the initial name. If
no MX records are found, but an A RR is found, the A RR is treated as
if it was associated with an implicit MX RR, with a preference of 0,
pointing to that host. If one or more MX RRs are found for a given
name, SMTP systems MUST NOT utilize any A RRs associated with that
name unless they are located using the MX RRs; the "implicit MX" rule
above applies only if there are no MX records present. If MX records
are present, but none of them are usable, this situation MUST be
reported as an error.
- erik
next reply other threads:[~2007-01-16 17:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-16 17:01 erik quanstrom [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-01-16 20:31 erik quanstrom
2007-01-16 20:50 ` geoff
2007-01-15 19:28 erik quanstrom
2007-01-15 19:42 ` Paul Lalonde
2007-01-15 16:55 Matthias Teege
2007-01-15 18:05 ` Federico Benavento
2007-01-15 19:22 ` Russ Cox
2007-01-15 18:10 ` geoff
2007-01-15 20:02 ` Matthias Teege
2007-01-15 23:35 ` Steve Simon
2007-01-16 16:46 ` Matthias Teege
2007-01-16 18:21 ` Steve Simon
2007-01-16 18:31 ` erik quanstrom
2007-01-16 18:44 ` Russ Cox
2007-01-16 18:52 ` lucio
2007-01-16 19:05 ` erik quanstrom
2007-01-16 19:30 ` Russ Cox
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=afcb163908214423c69212f9647e0cb0@coraid.com \
--to=quanstro@coraid.com \
--cc=9fans@cse.psu.edu \
--cc=mteege@gmail.com \
/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;
as well as URLs for NNTP newsgroup(s).