cname replace in mail address? [off-topic] (Re: Attn Ronald
Klop)
Don Lewis
truckman at FreeBSD.org
Fri Aug 27 23:13:34 UTC 2010
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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