Victor Duchovni a écrit : > On Fri, Jan 23, 2009 at 08:53:21PM +0100, mouss wrote: > >> wrong. >> >> the MX should not be a cname. see >> http://www.rfc-ignorant.org/policy-bogusmx.php >> >> use >> 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?
