On Sat, Jun 20, 2009 at 10:23 AM, Jean-Marie Schweizer <jeanmarieschwei...@gmail.com> wrote: > > For the DNS experts, these are the DNS records that I plan to use: > mydomain.com. MX 10 aspmx.l.google.com. > mydomain.com. MX 20 alt1.aspmx.l.google.com. > mydomain.com. MX 20 alt2.aspmx.l.google.com. > mydomain.com. MX 30 aspmx2.googlemail.com. > mydomain.com. MX 30 aspmx3.googlemail.com. > mydomain.com. MX 30 aspmx4.googlemail.com. > mydomain.com. MX 30 aspmx5.googlemail.com. > mydomain.com. CNAME proxy.heroku.com. > mail CNAME ghs.google.com. > www CNAME proxy.heroku.com.
Hi Jean-Marie, You cannot have a CNAME for mydomain.com if you have MX (or any other records) for it. You can find the authoritative answer in RFC 1034. http://tools.ietf.org/html/rfc1034 - Mike 3.6.2. Aliases and canonical names In existing systems, hosts and other resources often have several names that identify the same resource. For example, the names C.ISI.EDU and USC-ISIC.ARPA both identify the same host. Similarly, in the case of mailboxes, many organizations provide many names that actually go to the same mailbox; for example mockapet...@c.isi.edu, mockapet...@b.isi.edu, and p...@isi.edu all go to the same mailbox (although the mechanism behind this is somewhat complicated). Most of these systems have a notion that one of the equivalent set of names is the canonical or primary name and all others are aliases. The domain system provides such a feature using the canonical name (CNAME) RR. A CNAME RR identifies its owner name as an alias, and specifies the corresponding canonical name in the RDATA section of the RR. If a CNAME RR is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different. This rule also insures that a cached CNAME can be used without checking with an authoritative server for other RR types. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby or Rails Oceania" group. To post to this group, send email to rails-oceania@googlegroups.com To unsubscribe from this group, send email to rails-oceania+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rails-oceania?hl=en -~----------~----~----~----~------~----~------~--~---
