From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Delivered-To: caml-list@yquem.inria.fr Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39]) by yquem.inria.fr (Postfix) with ESMTP id 1722DBCA8 for ; Thu, 31 Mar 2005 15:05:26 +0200 (CEST) Received: from pauillac.inria.fr (pauillac.inria.fr [128.93.11.35]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id j2VD5PQJ017653 for ; Thu, 31 Mar 2005 15:05:25 +0200 Received: from nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id PAA02354 for ; Thu, 31 Mar 2005 15:05:25 +0200 (MET DST) Received: from saul.cis.upenn.edu (SAUL.CIS.upenn.edu [158.130.12.4]) by nez-perce.inria.fr (8.13.0/8.13.0) with ESMTP id j2VD5Lv5017495 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Thu, 31 Mar 2005 15:05:24 +0200 Received: from localhost (localhost [127.0.0.1]) by saul.cis.upenn.edu (8.12.10/8.12.9) with ESMTP id j2VD5LCP014118; Thu, 31 Mar 2005 08:05:21 -0500 (EST) Date: Thu, 31 Mar 2005 08:05:20 -0500 (EST) Message-Id: <20050331.080520.68550579.eijiro_sumii@anet.ne.jp> To: caml-list@inria.fr Cc: Francis.Dupont@enst-bretagne.fr, Xavier.Leroy@inria.fr, webmaster@brion.inria.fr Subject: Re: webmaster@caml.inria.fr is not a "legal" mail address From: Eijiro Sumii In-Reply-To: <200503311221.j2VCLd4O067700@givry.rennes.enst-bretagne.fr> References: <20050330.153853.71093932.sumii@saul.cis.upenn.edu> <200503311221.j2VCLd4O067700@givry.rennes.enst-bretagne.fr> X-Mailer: Mew version 3.2 on Emacs 20.7 / Mule 4.0 (HANANOEN) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Miltered: at concorde with ID 424BF595.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Miltered: at nez-perce with ID 424BF591.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; eijiro:01 sumii:01 eijiro:01 sumii:01 literals:01 rewrites:01 grrr:01 ...:98 ...:98 821:98 short:01 dmitry:01 rfc:02 caml:02 caml:02 X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on yquem.inria.fr X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.0.2 X-Spam-Level: From: Francis Dupont > => aliases (CNAME left parts) are legal in mail addresses. But RFC 1123 says as below, for example...? For more details, see also http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030203/049446.html for instance. In short, it does no "harm" in _most_ environments, but affects many systems at least. (I wonder what Dmitry meant by "webmaster@caml.inria.fr is not routable"...) ---------------------------------------------------------------------- 5.2.2 Canonicalization: RFC-821 Section 3.1 The domain names that a Sender-SMTP sends in MAIL and RCPT commands MUST have been "canonicalized," i.e., they must be fully-qualified principal names or domain literals, not nicknames or domain abbreviations. A canonicalized name either identifies a host directly or is an MX name; it cannot be a CNAME. ---------------------------------------------------------------------- > => it rewrites it because it checkes it and gets the canonical name as > a side effect, not because aliases are not legal... As explained above, they were illegal in MAIL and RCPT commands of SMTP, at least. Of course, you could argue that bodies (From: and To:) may be different from envelopes (MAIL and RCPT), though. The bottom line is that it is still a bad practice to use aliases in mail address domains for these reasons. Instead, we can just use A records in most cases. > PS: alias is a DNS concept, SMTP requires valid names (aliases or canonical > names) with a restriction in the character set (only digits, letters and > the character "-" not in the first position) for labels (names are made up > by labels separated by dots). Note that SMTP does not require the name > exists... Grrr...:-) Best regards, Eijiro