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RFC 2?821 and CNAMEs (was: seeking: Ian Jackson)



Thanks, Ian, for your reply. I don't quite agree with it though.

also sprach Ian Jackson <ian@davenant.greenend.org.uk> [2007.10.09.2102 +0100]:
> The prevailing IETF standard for mail transmission over the Internet
> is STD-10 (RFC821), which says:

RFC 2821 obsoletes STD-10, and says:

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.
   ^^^^^^^^^^^^^^^

Though I guess it gets interesting when we start to look at the
meaning of "obsoletes":

Abstract

   This document is a self-contained specification of the basic protocol
   for the Internet electronic mail transport.  It consolidates, updates
   and clarifies, but doesn't add new or change existing functionality
   of the following:  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

   -  the original SMTP (Simple Mail Transfer Protocol) specification of
      RFC 821 [30],

yes, one could argue.

> RFC2181 is helpful on this point:
> 
>  10.1.1. CNAME terminology

This is interesting for I really always thought it was the other way
around. Now I have to adjust the way I use that word in day to day
parlance.

> And yes, I'm afraid I agree with you - the spammers have indeed won.
> I regret the inconvenience.

No problem; I appreciate your time and the hole you punched for me.

-- 
 .''`.   martin f. krafft <madduck@debian.org>
: :'  :  proud Debian developer, author, administrator, and user
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