On Sat, Jan 24, 2009 at 09:15:27AM +0100, mouss wrote:
> >> IN MC 10 mail2.freewayprojects.com.
> >
> > This requirement was relaxed in RFC 2821. It is OK (though still
> > better not to if not necessary) to use CNAMES.
>
> my understanding is that RFC 5321 "went back". at least, this is what I
> understand from:
>
> When a domain name associated with an MX RR is looked up and the
> associated data field obtained, the data field of that response MUST
> contain a domain name. That domain name, when queried, MUST return
> at least one address record (e.g., A or AAAA RR) that gives the IP
> address of the SMTP server to which the message should be directed.
> Any other response, specifically including a value that will return a
> CNAME record when queried, lies outside the scope of this Standard.
> The prohibition on labels in the data that resolve to CNAMEs is
> discussed in more detail in RFC 2181, Section 10.3 [38].
>
> or am I misunderstanding this?
You appear to be right, while a CNAME in the sender or recipient domain
is now allowed, CNAMEs in the MX RRset are not.
--
Viktor.
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