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2821 and friends (Re: draft-eastlake-2606bis-00.txt: Suggestions for modifications)

Harald Tveit Alvestrand <harald@alvestrand.no> Thu, 20 October 2005 16:39 UTC

From: Harald Tveit Alvestrand <harald@alvestrand.no>
Subject: 2821 and friends (Re: draft-eastlake-2606bis-00.txt: Suggestions for modifications)
Date: Thu, 20 Oct 2005 18:39:17 +0200
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References: <200510201117.j9KBHYb6033105@drugs.dv.isc.org> <500955810D4CE03A82D7FC9C@svartdal.hjemme.alvestrand.no> <a06200701bf7d3958f4b4@[192.168.1.101]> <72E3B614EE413656376A863B@svartdal.hjemme.alvestrand.no> <20051020141307.99E4A11426@sa.vix.com> <209FCC95A2DF6AF7E4B6CF5F@svartdal.hjemme.alvestrand.no> <20051020161201.9A6E411425@sa.vix.com>
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Changing the subject on this particular tangent....

--On torsdag, oktober 20, 2005 16:12:01 +0000 Paul Vixie <paul@vix.com> 
wrote:

># hta@[129.241.1.99] is a valid email address. hta@129.241.1.99 isn't.
># Some mailers get it right, some don't.
>
> really?  i know that mailnames used to have to start with non-numeric, but
> 3com.com asked for a change and got it.  do the current (2821/2822)
> railroad diagrams really say that 129.241.1.99 is not a valid mailname?

RFC 2821:

3.6 Domains

   Only resolvable, fully-qualified, domain names (FQDNs) are permitted
   when domain names are used in SMTP.  In other words, names that can
   be resolved to MX RRs or A RRs (as discussed in section 5) are
   permitted, as are CNAME RRs whose targets can be resolved, in turn,
   to MX or A RRs.  Local nicknames or unqualified names MUST NOT be
   used.

.............

4.1.2 Command Argument Syntax

      Domain = (sub-domain 1*("." sub-domain)) / address-literal
      sub-domain = Let-dig [Ldh-str]

      address-literal = "[" IPv4-address-literal /
                            IPv6-address-literal /
                            General-address-literal "]"
            ; See section 4.1.3

      Mailbox = Local-part "@" Domain

Here's where the "hostname" charset restriction occurs too - but no text 
there about TLDs.


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