Date: Fri, 27 Aug 2010 16:01:44 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: ronald-freebsd8@thuis.klop.ws Cc: freebsd-stable@FreeBSD.org, avg@icyb.net.ua Subject: Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop) Message-ID: <201008272301.o7RN1ihT015533@gw.catspoiler.org> In-Reply-To: <op.vh3ay3dx8527sy@212-123-145-58.ip.telfort.nl>
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On 27 Aug, Ronald Klop wrote: > Mandatory? I'm googling, but can't find a document that declares it > mandatory and only sendmail seems to do it. > I think it is lame to use DNS info to rewrite e-mail addresses, but the > person who made it 'mandatory' will have good reasons for it. > > Does somebody have a pointer to the specs about this? <http://www.rfc-editor.org/rfc/rfc1123.txt>; 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.
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