SM wrote: > 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 fully-qualified domain name. That > fully-qualified 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 CNAME > RRs is discussed in more detail in RFC 2181, Section 10.3 [29].
That looks like a good compromise to me. I'd remove the word 'specifically', it makes me read the statement more than once to be sure of its meaning, and is probably redundant. Mark
